INSUPPORTABLE
indefensible, insupportable, unjustifiable, unwarrantable, unwarranted
(adjective) incapable of being justified or explained
Source: WordNet® 3.1
Etymology
Adjective
insupportable (comparative more insupportable, superlative most insupportable)
That cannot be tolerated or endured.
(of a statement, claim, argument, etc.) That cannot be supported; that cannot be demonstrated or proved.
Synonyms
• (made up of particularly small pieces): insufferable, intolerable, unbearable, unendurable
• (that cannot be demonstrated): indefensible, untenable
Source: Wiktionary
In`sup*port"a*ble, a. Etym: [L. insupportabilis: cf. F.
insupportable. See In- not, and Support.]
Definition: Incapable of being supported or borne; unendurable;
insufferable; intolerable; as, insupportable burdens; insupportable
pain.
– In`sup*port"a*ble*ness, n.
– In`sup*port"a*bly, adv.
Source: Webster’s Unabridged Dictionary 1913 Edition