diff --git a/idea/idea-completion/testData/weighers/smart/SmartPriority.kt b/idea/idea-completion/testData/weighers/smart/SmartPriority.kt
index 12408c8ca63..aa3b06f690a 100644
--- a/idea/idea-completion/testData/weighers/smart/SmartPriority.kt
+++ b/idea/idea-completion/testData/weighers/smart/SmartPriority.kt
@@ -23,4 +23,6 @@ class C {
 // ORDER: nullableX
 // ORDER: takeIf
 // ORDER: takeIf
+// ORDER: takeUnless
+// ORDER: takeUnless
 // ORDER: C
diff --git a/libraries/stdlib/src/kotlin/util/Standard.kt b/libraries/stdlib/src/kotlin/util/Standard.kt
index 8230397d539..ab1835108af 100644
--- a/libraries/stdlib/src/kotlin/util/Standard.kt
+++ b/libraries/stdlib/src/kotlin/util/Standard.kt
@@ -68,6 +68,13 @@ public inline fun <T, R> T.let(block: (T) -> R): R = block(this)
 @SinceKotlin("1.1")
 public inline fun <T> T.takeIf(predicate: (T) -> Boolean): T? = if (predicate(this)) this else null
 
+/**
+ * Returns `this` value if it _does not_ satisfy the given [predicate] or `null`, if it does.
+ */
+@kotlin.internal.InlineOnly
+@SinceKotlin("1.1")
+public inline fun <T> T.takeUnless(predicate: (T) -> Boolean): T? = if (!predicate(this)) this else null
+
 /**
  * Executes the given function [action] specified number of [times].
  *