to stare blankly or gaze into space; to play the fool or pretend to be stupid; to loiter around aimlessly

to stare blankly or gaze into space without thinking

(variant form) to be lost in thought, to daze off, or to look with a blank expression

(variant form) fool or simpleton

to be transfixed or struck dumb by what one sees; to stare blankly in amazement

senile dementia; Alzheimer's disease