unthoughtful (adj.)
- arbitrary
- capricious
- careless
- forgetful
- heedless
- ill-advised
- ill-considered
- ill-judged
- impolitic
- imprudent
- inadvertent
- inadvisable
- inconsiderate
- indiscreet
- inexpedient
- injudicious
- insensate
- irrational
- mindless
- misguided
- myopic
- reasonless
- reckless
- senseless
- shortsighted
- thoughtless
- unaccommodating
- unadvised
- unconsidered
- uncooperative
- undiscerning
- unguarded
- unhelpful
- unmindful
- unobliging
- unreasonable
- unreasoning
- unreflective
- unseeing
- unsound
- unthinking
- unwise
- witless
