Synonyms of insupportable in English:

insupportable


See US English definition of insupportable

See UK English definition of insupportable

See Spanish definition of insoportable

adjective

1‘this view appears insupportable’

SYNONYMS
unjustifiable, without justification, indefensible, inexcusable, unforgivable, unpardonable, unwarrantable, unreasonable
groundless, unfounded, without foundation, foundationless, baseless, without basis, unsupported, unsubstantiated, unconfirmed, uncorroborated, invalid, untenable, implausible, weak, shaky, flawed, specious, defective
ANTONYMS

justified

2‘the heat in Cairo was insupportable’

SYNONYMS
intolerable, insufferable, unbearable, unendurable, unacceptable, oppressive, overwhelming, overpowering, impossible, not to be borne, past bearing, too much to bear, more than one can stand, more than flesh and blood can stand
unspeakable, dreadful, excruciating
informal too much
ANTONYMS

bearable, congenial