flimsy

Synonyms: chiffon cutrate decrepit defective delicate diaphanous feeble fragile frail gauzy gossamer house of cards inadequate infirm insubstantial meager papery rickety rinkydink shaky shallow sheer slapdash sleazy slight superficial tacky transparent unsound unsubstantial weak wobbly

Antonyms: firm heavy solid strong sturdy substantial thick tough

Synonyms: assailable baseless contemptible controvertible fallacious false feeble frivolous groundless illogical improbable inadequate inane inconceivable incredible inept lame poor puerile superficial thin transparent trifling trivial unbelievable ungrounded unpersuasive unreasonable unsatisfactory unsubstantial weak weakly wishful

Antonyms: convincing plausible reasonable serious strong