unsound (adj.)
- abnormal
- adulterated
- afflicted
- ailing
- antinomian
- apocryphal
- batty
- blemished
- brainsick
- broken-down
- cachectic
- chancy
- crackbrained
- cracked
- crazed
- crazy
- daft
- damaged
- dangerous
- debilitated
- decayed
- decrepit
- defective
- deficient
- delicate
- demented
- deranged
- desultory
- dilapidated
- diseased
- disoriented
- distraught
- doubtful
- drained
- dubious
- enervated
- erroneous
- exhausted
- failing
- fallacious
- fallible
- faulty
- feeble
- flawed
- flighty
- flimsy
- fragile
- frail
- groundless
- hairy
- hazardous
- heretical
- heterodox
- ill
- ill-advised
- ill-considered
- ill-judged
- illogical
- immature
- impaired
- imperfect
- impolitic
- imprecise
- imprudent
- impure
- inaccurate
- inadequate
- inadvisable
- incomplete
- inconclusive
- inconsiderate
- incorrect
- indebted
- indiscreet
- inexact
- inexpedient
- infirm
- injudicious
- injured
- insane
- insecure
- insensate
- insolvent
- insubstantial
- invalid
- irrational
- lacking
- loco
- lunatic
- mad
- maddened
- makeshift
- manic
- mazed
- mediocre
- mental
- mindless
- misguided
- mixed
- morbid
- moribund
- myopic
- odd
- off
- pale
- pantheist
- pantheistic
- partial
- patchy
- pathological
- peaked
- peaky
- perilous
- poor
- precarious
- provisional
- psychotic
- queer
- ramshackle
- reasonless
- reckless
- reduced
- rickety
- risky
- rocky
- rotten
- run-down
- senseless
- shaky
- shifting
- shifty
- short
- shortsighted
- sick
- sickly
- sketchy
- slippery
- specious
- strange
- temporary
- tentative
- thoughtless
- ticklish
- tottering
- tottery
- touched
- treacherous
- unaccepted
- unadvised
- unauthentic
- unbalanced
- uncertain
- unconsidered
- undependable
- undeveloped
- undiscerning
- uneven
- unfinished
- unfirm
- unfounded
- unhealthy
- unhinged
- unorthodox
- unpredictable
- unproved
- unreasonable
- unreflective
- unreliable
- unsafe
- unseeing
- unsettled
- unstable
- unsteady
- unsubstantial
- unsure
- untenable
- unthinking
- unthoughtful
- untrue
- untrustworthy
- unwell
- unwholesome
- unwise
- valetudinarian
- valetudinary
- wandering
- weak
- weakened
- weakly
- wicked
- witless
- wobbly
- wounded
- wrong
