Synonyms of insubstantial in English:

insubstantial


See US English definition of insubstantial

See UK English definition of insubstantial

See Spanish definition of frágil

adjective

1‘these insubstantial structures cannot be converted into satisfactory dwellings’

SYNONYMS
flimsy, slight, light, fragile, breakable, weak, frail, shaky, unstable, wobbly, tottery, rickety, ramshackle, makeshift
jerry-built, badly built, thrown together, cheap, shoddy, gimcrack
ANTONYMS

sturdy

2‘insubstantial evidence’

SYNONYMS
weak, flimsy, feeble, poor, inadequate, insufficient, thin, slight, tenuous, insignificant, inconsequential, unsubstantial, unconvincing, implausible, unsatisfactory, paltry, trifling, trivial, shallow
ANTONYMS

sound

3‘she felt worried, in an insubstantial yet unsettling way’

SYNONYMS
intangible, impalpable, indefinable, indescribable, vague, obscure, unclear, indistinct
untouchable, imperceptible to the touch, unsubstantial, incorporeal
imaginary, imagined, fancied, fanciful, figmental, unreal, non-existent, illusory, illusive, delusive, hallucinatory, phantom, spectral, ghostlike, visionary, chimerical, airy, vaporous
rare immaterial, unbodied, discarnate, phantasmal, phantasmic, inexistent, illusionary
ANTONYMS

tangible, real