diff --git a/nac3core/src/codegen/expr.rs b/nac3core/src/codegen/expr.rs
index f360c78..474052a 100644
--- a/nac3core/src/codegen/expr.rs
+++ b/nac3core/src/codegen/expr.rs
@@ -30,7 +30,7 @@ use crate::{
     },
     typecheck::{
         typedef::{FunSignature, FuncArg, Type, TypeEnum, Unifier, VarMap},
-        magic_methods::{binop_name, binop_assign_name},
+        magic_methods::{binop_name, binop_assign_name, unaryop_name},
     },
 };
 use inkwell::{
@@ -1306,18 +1306,27 @@ pub fn gen_unaryop_expr_with_values<'ctx, G: CodeGenerator>(
 
     Ok(Some(if ty == ctx.primitives.bool {
         let val = val.into_int_value();
-        match op {
-            ast::Unaryop::Invert | ast::Unaryop::Not => {
-                let not = ctx.builder.build_not(val, "not").unwrap();
-                let not_bool = ctx.builder.build_and(
-                    not,
-                    not.get_type().const_int(1, false),
-                    "",
-                ).unwrap();
+        if *op == ast::Unaryop::Not {
+            let not = ctx.builder.build_not(val, "not").unwrap();
+            let not_bool = ctx.builder.build_and(
+                not,
+                not.get_type().const_int(1, false),
+                "",
+            ).unwrap();
+    
+            not_bool.into()
+        } else {
+            let llvm_i32 = ctx.ctx.i32_type();
 
-                not_bool.into()
-            }
-            _ => val.into(),
+            gen_unaryop_expr_with_values(
+                generator,
+                ctx,
+                op,
+                (
+                    &Some(ctx.primitives.int32),
+                    ctx.builder.build_int_z_extend(val, llvm_i32, "").map(Into::into).unwrap()
+                ),
+            )?.unwrap()
         }
     } else if [ctx.primitives.int32, ctx.primitives.int64, ctx.primitives.uint32, ctx.primitives.uint64].contains(&ty) {
         let val = val.into_int_value();
@@ -1353,6 +1362,18 @@ pub fn gen_unaryop_expr_with_values<'ctx, G: CodeGenerator>(
             None,
         );
 
+        // ndarray uses `~` rather than `not` to perform elementwise inversion, convert it before
+        // passing it to the elementwise codegen function
+        let op = if ndarray_dtype.obj_id(&ctx.unifier).is_some_and(|id| id == PRIMITIVE_DEF_IDS.bool) {
+            if *op == ast::Unaryop::Invert {
+                &ast::Unaryop::Not
+            } else {
+                unreachable!("ufunc {} not supported for ndarray[bool, N]", unaryop_name(op))
+            }
+        } else {
+            op
+        };
+
         let res = numpy::ndarray_elementwise_unaryop_impl(
             generator,
             ctx,
@@ -1364,7 +1385,7 @@ pub fn gen_unaryop_expr_with_values<'ctx, G: CodeGenerator>(
                     generator,
                     ctx,
                     op,
-                    (&Some(ndarray_dtype), val)
+                    (&Some(ndarray_dtype), val),
                 )?.unwrap().to_basic_value_enum(ctx, generator, ndarray_dtype)
             },
         )?;
diff --git a/nac3core/src/typecheck/magic_methods.rs b/nac3core/src/typecheck/magic_methods.rs
index 59067b8..dc7afe5 100644
--- a/nac3core/src/typecheck/magic_methods.rs
+++ b/nac3core/src/typecheck/magic_methods.rs
@@ -472,23 +472,47 @@ pub fn typeof_unaryop(
     op: &Unaryop,
     operand: Type,
 ) -> Result<Option<Type>, String> {
-    if *op == Unaryop::Not && operand.obj_id(unifier).is_some_and(|id| id == primitives.ndarray.obj_id(unifier).unwrap()) {
+    let operand_obj_id = operand.obj_id(unifier);
+
+    if *op == Unaryop::Not && operand_obj_id.is_some_and(|id| id == primitives.ndarray.obj_id(unifier).unwrap()) {
         return Err("The truth value of an array with more than one element is ambiguous".to_string())
     }
 
     Ok(match *op {
         Unaryop::Not => {
-            match operand.obj_id(unifier) {
+            match operand_obj_id {
                 Some(v) if v == PRIMITIVE_DEF_IDS.ndarray => Some(operand),
                 Some(_) => Some(primitives.bool),
                 _ => None
             }
         }
 
-        Unaryop::Invert
-        | Unaryop::UAdd
+        Unaryop::Invert => {
+            if operand_obj_id.is_some_and(|id| id == PRIMITIVE_DEF_IDS.bool) {
+                Some(primitives.int32)
+            } else if operand_obj_id.is_some_and(|id| PRIMITIVE_DEF_IDS.iter().any(|prim_id| id == prim_id)) {
+                Some(operand)
+            } else {
+                None
+            }
+        }
+
+        Unaryop::UAdd
         | Unaryop::USub => {
-            if operand.obj_id(unifier).is_some_and(|id| PRIMITIVE_DEF_IDS.iter().any(|prim_id| id == prim_id)) {
+            if operand_obj_id.is_some_and(|id| id == PRIMITIVE_DEF_IDS.ndarray) {
+                let (dtype, _) = unpack_ndarray_var_tys(unifier, operand);
+                if dtype.obj_id(unifier).is_some_and(|id| id == PRIMITIVE_DEF_IDS.bool) {
+                    return Err(if *op == Unaryop::UAdd {
+                        "The ufunc 'positive' cannot be applied to ndarray[bool, N]".to_string()
+                    } else {
+                        "The numpy boolean negative, the `-` operator, is not supported, use the `~` operator function instead.".to_string()
+                    })
+                }
+
+                Some(operand)
+            } else if operand_obj_id.is_some_and(|id| id == PRIMITIVE_DEF_IDS.bool) {
+                Some(primitives.int32)
+            } else if operand_obj_id.is_some_and(|id| PRIMITIVE_DEF_IDS.iter().any(|prim_id| id == prim_id)) {
                 Some(operand)
             } else {
                 None
@@ -571,7 +595,9 @@ pub fn set_primitives_magic_methods(store: &PrimitiveStore, unifier: &mut Unifie
 
     /* bool ======== */
     let ndarray_bool_t = make_ndarray_ty(unifier, store, Some(bool_t), None);
+    impl_invert(unifier, store, bool_t, Some(int32_t));
     impl_not(unifier, store, bool_t, Some(bool_t));
+    impl_sign(unifier, store, bool_t, Some(int32_t));
     impl_eq(unifier, store, bool_t, &[bool_t, ndarray_bool_t], None);
 
     /* ndarray ===== */
diff --git a/nac3standalone/demo/src/operators.py b/nac3standalone/demo/src/operators.py
index 8933cbe..06e7dee 100644
--- a/nac3standalone/demo/src/operators.py
+++ b/nac3standalone/demo/src/operators.py
@@ -1,5 +1,9 @@
 from __future__ import annotations
 
+@extern
+def output_bool(x: bool):
+    ...
+
 @extern
 def output_int32(x: int32):
     ...
@@ -17,6 +21,7 @@ def output_float64(x: float):
     ...
 
 def run() -> int32:
+    test_bool()
     test_int32()
     test_uint32()
     test_int64()
@@ -25,6 +30,18 @@ def run() -> int32:
     # test_B()
     return 0
 
+def test_bool():
+    t = True
+    f = False
+    output_bool(not t)
+    output_bool(not f)
+    output_int32(~t)
+    output_int32(~f)
+    output_int32(+t)
+    output_int32(+f)
+    output_int32(-t)
+    output_int32(-f)
+
 def test_int32():
     a = 17
     b = 3