fatuous (adj.)
- absurd
- airy
- apish
- asinine
- barren
- batty
- beguiled
- besotted
- blank
- bootless
- brainless
- buffoonish
- calm
- catchpenny
- chimerical
- cockeyed
- counterproductive
- crazy
- credulous
- daft
- dazed
- dizzy
- doting
- dreamlike
- dumb
- effete
- empty
- empty-headed
- ethereal
- etiolated
- fanciful
- feckless
- flaky
- flimsy
- fond
- foolish
- frivolous
- frothy
- fruitless
- fuddled
- futile
- gaga
- gaseous
- goofy
- hollow
- idiotic
- idle
- illusory
- imaginary
- imbecile
- inadequate
- inane
- ineffective
- ineffectual
- inefficacious
- inept
- infatuated
- inoperative
- insane
- insensate
- invalid
- kooky
- light
- loony
- mad
- maudlin
- moronic
- nugatory
- nutty
- oblivious
- otiose
- passive
- rarefied
- relaxed
- sappy
- screwy
- senseless
- sentimental
- shadowy
- shallow
- silly
- slender
- slight
- spirituous
- sterile
- stupid
- subtle
- superficial
- tenuous
- thoughtless
- tranquil
- trifling
- trite
- trivial
- unavailing
- unoccupied
- unreal
- unreasoning
- unthinking
- useless
- vacant
- vacuous
- vain
- vapid
- vaporous
- wacky
- wet
- windy
- witless
