Cogitation :: Cogitation (n.) The act of thinking; thought; meditation; contemplation.
Cogitative :: Cogitative (a.) Possessing, or pertaining to, the power of thinking or meditating..
Excogitation :: Excogitation (n.) The act of excogitating; a devising in the thoughts; invention; contrivance.
Incogitative :: Incogitative (a.) Not cogitative; not thinking; wanting the power of thought; as, a vegetable is an incogitative being..
Incogitativity :: Incogitativity (n.) The quality of being incogitative; want of thought or of the power of thinking.