- unsound
- a.
1.Defective, imperfect, impaired, decayed, rotten.2.Diseased, sickly, weakly, poorly, infirm, unhealthy, morbid, feeble.3.Erroneous, wrong, false, fallacious, incorrect, deceitful, sophistical, illogical, defective, untenable, invalid, unsubstantial, faulty, hollow.4.Deceitful, dishonest, untrustworthy.5.Insincere, false, unfaithful, untrue.6.Questionable, defective.7.Disturbed, light.8.Thin, weak.9.Insubstantial, unreal.10.Heterodox, heretical, unorthodox, defective.
New dictionary of synonyms. 2014.