Roget's Thesaurus of English Words and Phrases by Peter Mark Roget

452. [Absence or want of thought.] Incogitancy — N. incogitancy†,

vacancy, inunderstanding†; fatuity &c 499; thoughtlessness &c (inattention) 458; vacuity. couch potato, vegetable. V. not think &c 451; not think of; dismiss from the mind, dismiss from the thoughts &c 451. indulge in reverie &c (be inattentive) 458. put away thought; unbend the mind, relax the mind, divert the mind, veg out. Adj. vacant, unintellectual, unideal†, unoccupied, unthinking, inconsiderate, thoughtless, mindless, no-brain, vacuous; absent &c (inattentive) 458; diverted; irrational &c 499; narrow-minded &c 481. unthought of, undreamt 'of, unconsidered; off one's mind; incogitable†, not to be thought of. Phr. absence d'esprit; pabulum pictura pascit inani [Lat.].