| unobserving(adjective, careless, indifferent, apathetic, distracted) |
| unperceiving(adjective, careless, indifferent, apathetic, insensitive) |
| unperceptive(adjective, blind, obtuse, unobservant) |
| unpremeditated(careless, thoughtless, ignorant, hidden, unconscious) |
| unseeing(adjective, dull, careless, indifferent, thoughtless) |
| untactful(careless, thoughtless, inconsiderate) |
| unwise(adjective, careless, thoughtless, inconsiderate, imprudent) |
| witless(adjective, careless, silly, foolish, innocent) |
| Lethean |
| accidental(ignorant, hidden, unconscious, unknowing, unaware) |
| airheaded(adjective, careless, remote, vague, sloppy) |
| airy |
| amnemonic(adjective, careless, vague, sloppy, inattentive) |
| amnesiac |
| amnestic |
| any old way(expression, idiom, careless, bold, thoughtless) |
| any way(expression, soft, tolerant, slack, lenient) |
| apprenticed(adjective, innocent, thick, unfamiliar, unconscious) |
| asleep |
| asleep at switch(expression, adjective, idiom, slow, careless) |