c. 1400, "inexpressible," from un- (1) "not" + speakable (see speak (v.)). Meaning "indescribably bad or wicked" is recorded from mid-15c. Related: Unspeakably.
unspeakable happiness
an unspeakable odor came sweeping into the room
unsophisticated
unsorted
unsought
unsound
unsparing
unspeakable
unspoiled
unspoken
unsporting
unsportsmanlike
unstable
