crackbrained
Wildly without sense
Crackbrained means crazy or extremely foolish, suggesting a mind with a crack in it—damaged, not functioning properly.
The word is old-fashioned and somewhat literary: a crackbrained scheme to get rich quick, some crackbrained inventor.
It implies impractical thinking rather than clinical insanity.
Holding false beliefs firmly
- unhingedMentally or emotionally unstable
- unsoundWeak or flawed
- unbalancedLacking equilibrium or stability
- derangedMentally disturbed, irrational
disturbed · unstable · disordered · touched · crazed · lunatic · maniacal · manic
Absurdly unreasonable or inappropriate
- preposterousCompletely contrary to reason
- nonsensicalWithout coherent meaning
- ridiculousInviting scorn through absurdity
- outlandishStrikingly weird or foreign-seeming
fantastical · cockamamie · asinine · farcical · far-fetched · improbable · wild · screwy
Recklessly stupid or impractical
- scatterbrainedLacking mental focus
- featherbrainedSilly and unfocused
- dimwittedLacking mental acuity
- simplemindedLacking mental acuity
imprudent · unwise · thoughtless · reckless · silly · inane · giddy · flighty
delusional
Holding false beliefs firmly
- unhingedMentally or emotionally unstable
- unsoundWeak or flawed
- unbalancedLacking equilibrium or stability
deranged · disturbed · unstable · disordered · touched · crazed · lunatic · maniacal · manic · mad
ludicrous
Absurdly unreasonable or inappropriate
- preposterousCompletely contrary to reason
- nonsensicalWithout coherent meaning
- ridiculousInviting scorn through absurdity
outlandish · fantastical · cockamamie · asinine · farcical · far-fetched · improbable · wild · screwy · wacky
harebrained
Recklessly stupid or impractical
- scatterbrainedLacking mental focus
- featherbrainedSilly and unfocused
- dimwittedLacking mental acuity
simpleminded · imprudent · unwise · thoughtless · reckless · silly · inane · giddy · flighty · frivolous
quirky
Idiosyncratically unusual
- unconventionalDeparting from standard practice
- idiosyncraticDistinctively individual in nature
- offbeatPleasantly strange or unusual
oddball · peculiar · erratic · strange · weird · cranky · crackpot · dotty · potty · crotchety
crackbrainedsane
Mentally healthy, clearheaded
sound · lucid · balanced · stable · well-adjusted
cracked, brainy, cracker, crackle, brainless, brainchild, brained, brainwave, braincase