unsound Antonyms

sound valid toning tintinnabulation thriving thoroughpaced sustainable sure surd sturdy tough toughish unfailing unerring tuff trysting trusty trustworthy true-hearted true tried strong strengthy seaworthy sapient sane salubrious safe rugged robust rigorous secure sensible sober strapping stoner steady steadfast statistical stalwart stable solid right-minded well-preserved positivistic self-consistent unattackable alive and kicking solid-state unswerving