insufferable, insupportable, intolerable, unbearable, unendurable

unacceptablecrushing, overwhelmingcomfortless, hard, harsh, painful, uncomfortableappalling, dreadful, excruciating, gruesome(also grewsome), harrowing, horrendous, horrible, horrid, horrifying, nightmarish, shocking, terrible, tormenting, torturous, vile, wretchedacute, extreme, intense, piercingdisgusting, distasteful, loathsome, nauseating, obnoxious, offensive, repugnant, repulsive, revolting, sickeningheinous, noxious, odious, unspeakable

endurable, sufferable, supportable, sustainable, tolerable

livable(also liveable)acceptableadequate, admissible, allowable, reasonable, satisfactory