Absent in mind; abstracted; preoccupied.
Distracted or inattentive; preoccupied with one's thoughts to such an extent that one forgets commonplace needs; absent minded, absent-minded

Stupid and confused; used especially of persons; SYN. addlepated, potty, puddingheaded, muddleheaded.

1. Confused and vague; used especially of thinking; SYN. befuddled, muddled, muzzy, woolly, wooly, woolly-headed, wooly-minded.
2. (Of eggs) No longer edible.

Persistently or morbidly thoughtful; SYN. broody, contemplative, meditative, musing, pensive, pondering, reflective, ruminative.

Having the attention diverted especially because of anxiety; SYN. distrait.

1. Absent-mindedly irresponsible; SYN. head-in-the-clouds, scatterbrained.
2. Irresponsibly frivolous; SYN. flyaway.

ETYM Cf. French inattentif.
1. Not paying attention; SYN. unobservant, unvigilant, unwatchful.
2. Not showing due care or attention; SYN. neglectful.
3. Showing a lack of attention.
4. Uninterested; bored.
5. Unwilling to hear; SYN. unheeding, unlistening, deaf to.

1. Lacking the thinking capacity characteristic of a conscious being
2. Not marked by the use of reason; SYN. reasonless, senseless.
3. Requiring little mental effort

ETYM Latin obliviosus: cf.French oblivieux.
(Followed by 'to' or 'of') Lacking conscious awareness of; SYN. unmindful.

Out of touch with reality

Unable to think in a clear and orderly manner; giddy or frivolous