Synonymes unsound (anglais)

Adjectif
- dangerous : risky, hazardous, treacherous, perilous, chancy, unreliable, unsubstantial
- false : fallacious, wrong, faulty, invalid, unfounded, untenable, senseless
- flimsy : insubstantial, weak, fragile, frangible, breakable, infirm
- impaired : defective, crazed, demented, diseased, ill, unhealthy, unwholesome