Antonyms of adj cogitable

1 sense of cogitable

Sense 1
cogitable, ponderable -- (capable of being thought about; "space flight to other galaxies becomes more cogitable")

INDIRECT (VIA thinkable) -> unthinkable -- (incapable of being conceived or considered)

Similarity of adj cogitable

1 sense of cogitable

Sense 1
cogitable, ponderable -- (capable of being thought about; "space flight to other galaxies becomes more cogitable")
       => thinkable (vs. unthinkable) -- (capable of being conceived or imagined or considered)