|ən+ adjective
Etymology: Middle English unspekeable, from un- (I) + speken to speak + -able
1.
a. : not capable of being verbally expressed : unutterable , indescribable
watching the unspeakable beauties of that wondrous bay — Martha Kean
with unspeakable delight … took and divided the gifts — Francis Parkman
all creative work starts as a feeling … or some other unspeakable affective state — A.H.S.Korzybski
b. : indescribably objectionable or hateful
that unspeakable odor came sweeping into the room, wave upon wave of the breath of all corruption — Arthur Grimble
so likable as a man, so unspeakable as a politician — Francis Biddle
those poor painted females … plied their unspeakable trade — D.B.Chidsey
2. : that may not or cannot be uttered or spoken
oddest of all are the bawdy thoughts that come into one's head — the unspeakable words — L.P.Smith
our job to see that a speaker does not have to contend with unspeakable collections of consonants — Rosemary Jellis