filterNot

Returns a sequence containing all elements not matching the given predicate.

fun <T> Sequence<T>.filterNot(predicate: (T) -> Boolean): Sequence<T>(source)

val numbers = listOf(1, 2, 3, 4, 5)

val oddNumbers = numbers.asSequence()
    .filterNot { it % 2 == 0 }
    .toList()

println(oddNumbers)   // [1, 3, 5]

Source