adjective
1.
Synonyms: tenuous 3, feeble, insubstantial
Antonyms: substantial
2.
Synonyms: implausible , flimsy, improbable, inconceivable, incredible, thick, thin, unbelievable, unconvincing, weak
3.
Synonyms: immaterial 1, bodiless, incorporeal, insubstantial, metaphysical, nonmaterial, nonphysical, spiritual, unembodied, unphysical
Antonyms: substantial
4.
Synonyms: weak 1, decrepit, feeble, flimsy, fragile, frail, infirm, unsound, ||wanky, weakly
Related Word: insecure, shaky, undependable
Antonyms: substantial