unsound

Synonyms of UNSOUND

adjective

risky, hazardous, treacherous, perilous, chancy, unreliable, unsubstantial

fallacious, wrong, faulty, invalid, unfounded, untenable, senseless

insubstantial, weak, fragile, frangible, breakable, infirm

defective, crazed, demented, diseased, ill, unhealthy, unwholesome