futile (adj.)
- abortive
- absurd
- airy
- apish
- asinine
- bad
- barren
- batty
- beguiled
- besotted
- bootless
- brainless
- buffoonish
- catchpenny
- cockeyed
- counterproductive
- crazy
- credulous
- daft
- dazed
- dizzy
- doomed
- doting
- dumb
- effete
- empty
- etiolated
- failing
- fatuous
- feckless
- flaky
- flimsy
- fond
- foolish
- frivolous
- frothy
- fruitless
- fuddled
- gaga
- goofy
- hollow
- idiotic
- idle
- ill-advised
- ill-considered
- ill-timed
- imbecile
- impolitic
- impotent
- improper
- inadequate
- inadvisable
- inane
- inappropriate
- inapt
- incongruous
- ineffective
- ineffectual
- inefficacious
- inefficient
- inept
- inexpedient
- infatuated
- infelicitous
- inoperative
- inopportune
- insane
- insufficient
- invalid
- kooky
- lame
- light
- loony
- mad
- malapropos
- manque
- maudlin
- moronic
- nugatory
- nutty
- otiose
- profitless
- sappy
- screwy
- senseless
- sentimental
- shallow
- silly
- slender
- slight
- sterile
- stillborn
- stupid
- superficial
- thoughtless
- trifling
- trite
- trivial
- unavailable
- unavailing
- unbefitting
- undesirable
- unfit
- unfitting
- unfortunate
- unhappy
- unproductive
- unprofitable
- unsatisfactory
- unseasonable
- unseemly
- unsuccessful
- unsuitable
- untimely
- unwise
- useless
- vacuous
- vain
- vapid
- wacky
- wet
- windy
- witless
- worthless
- wrong
