Englishunconscionable
adjective
1 the unconscionable use of humans as test animals:
unethical, amoral, immoral, unprincipled, indefensible, wrong;
unscrupulous, unfair, underhand, dishonourable, dishonest, corrupt, depraved;
informal shady.
▷antonyms ethical, acceptable.
2 we have had to wait an unconscionable time:
excessive, unwarranted, uncalled for, unreasonable, unfair, inordinate, disproportionate, immoderate, extreme, undue, outrageous, preposterous, monstrous, inexcusable, unnecessary, needless;
informal over the top, OTT.
▷antonyms acceptable, moderate, reasonable.
unconscionable Oxford Dictionary of English