inane (adj.)
- absurd
- aimless
- airy
- apish
- arid
- asinine
- awkward
- bare
- barren
- batty
- beguiled
- besotted
- bland
- blank
- bleached
- bloodless
- bonkers
- bootless
- brainless
- buffoonish
- callow
- calm
- catchpenny
- characterless
- clear
- cockeyed
- cold
- colorless
- counterproductive
- crazy
- credulous
- daft
- dazed
- dead
- devoid
- dilute
- diluted
- doting
- dotty
- dreary
- dry
- dull
- dumb
- dusty
- effete
- elephantine
- empty
- empty-headed
- etiolated
- fatuous
- featureless
- feckless
- flaky
- flat
- flavorless
- flimsy
- fond
- foolish
- frivolous
- frothy
- fruitless
- fuddled
- futile
- gaga
- garbled
- gauche
- goofy
- green
- groping
- heavy
- ho-hum
- hollow
- idiotic
- idle
- ignorant
- imbecile
- imbecilic
- inadequate
- indifferent
- ineffective
- ineffectual
- inefficacious
- inept
- inexperienced
- infatuated
- innocent
- innocuous
- inoperative
- insane
- insignificant
- insipid
- invalid
- jejune
- kooky
- laughable
- leaden
- lifeless
- light
- loony
- low-spirited
- ludicrous
- lunatic
- mad
- maudlin
- meaningless
- mild
- moronic
- naive
- namby-pamby
- nescient
- nonsensical
- nugatory
- null
- nuts
- nutty
- oblivious
- otiose
- pale
- pallid
- passive
- pedestrian
- phatic
- plodding
- pointless
- poky
- ponderous
- preposterous
- pulpy
- purposeless
- rattlebrained
- raw
- relaxed
- ridiculous
- risible
- sapless
- sappy
- savorless
- scatterbrained
- scrambled
- screwy
- senseless
- sentimental
- shallow
- silly
- simple
- slender
- slight
- slow
- solemn
- spiritless
- stale
- sterile
- stiff
- stodgy
- stuffy
- stupid
- superficial
- tasteless
- tedious
- tentative
- thin
- thoughtless
- tranquil
- trifling
- trite
- trivial
- unacquainted
- unavailing
- uncomprehending
- unenlightened
- unfamiliar
- unflavored
- unilluminated
- uninformed
- uninitiated
- unintelligent
- unknowing
- unmeaning
- unoccupied
- unreasonable
- unreasoning
- unrelieved
- unripe
- unsavory
- unsure
- unthinking
- unversed
- useless
- vacant
- vacuous
- vain
- vapid
- void
- wacky
- washy
- watered
- watery
- weak
- wet
- white
- windy
- wishy-washy
- witless
- wooden
