(a.) Incapable of being supported or borne; unendurable; insufferable; intolerable; as, insupportable burdens; insupportable pain.

Herculean Latinate OK Roscius abeyant abstruse abundant accented ace-high actor actress acute adamantine adhesive aesthetic aesthetically appealing alveolar ample amylaceous anesthetized annoying antagonist anticipating antihero apathetic apical apico-alveolar apico-dental arcane arduous arid articulated assimilated attractive awe-inspiring awful awkward back backbreaking bad bad guy bang-up baritone barnstormer barren barytone bass beauteous beautiful benumbed besetting big big with child big-laden bilabial bit bit part blah blank blase bleak blimp bloodless blunt blunt-witted bombastic bonzer bored boring boss bothersome breeding broad broad-bodied bulky bullnecked bully burdened burdensome burdensomely buskined but good cacuminal carrying carrying a fetus cast castellatus cataleptic catatonic central cerebral character character actor character man character woman characterless checked cheerless child actor chubby cirrose cirrous clabbered clammy close close-knit close-textured close-woven clotted cloud-flecked clouded cloudy clumsy coagulated coarse cold colorless comatose compact compacted complex comprehensive compressed concentrated concrete condensed congested consequential considerable consolidated consonant consonantal continuant contralto cool copious corking corpulent cothurned crackerjack crammed crammed full cramped crass crestfallen critical crowded crucial crushing cue cumbersome cumbersomely cumbrous cumuliform cumulous curdled dandy dark dead debilitated deep deep-echoing deep-pitched deep-toned deepmouthed dejected delicious dense dental depressed depressing despondent difficult dim dim-witted dirty disconsolate diseur diseuse dismal dissimilated distressful distressing doped dopey dormant dorsal doughy downcast downhearted dozy draggy dramatizer dreamy drearisome dreary droopy drowsy drugged drugged with sleep dry dryasdust ducky dull dull of mind dull-headed dull-pated dull-witted durable dusty earnest effete effortful elegant elephantine empty encumbered endowed with beauty enduring enervated esoteric etiolated exanimate excessive exhausting exhaustive expectant expecting exquisite exuberant eye-filling fab fade fat fat part fat-witted fatal fateful fatty feeder fine fine and dandy firm flat fleshy flourishing flowerlike foil forced forceful formal formidable foul front