Synonyms of diabolical in English:

diabolical


See definition of diabolical

adjective

1‘his diabolical skill’

SYNONYMS

devilish, diabolic, fiendish, satanic, Mephistophelian, demonic, demoniacal, hellish, infernal, evil, wicked, ungodly, unholy

rare cacodemonic

2‘the team manager was sacked after that diabolical performance’

SYNONYMS

very bad, poor, dreadful, awful, terrible, frightful, disgraceful, shameful, lamentable, deplorable, appalling, atrocious

inferior, substandard, mediocre, unsatisfactory, inadequate, second-rate, third-rate, shoddy, inept, bungling, hopeless

crummy, dire, dismal, God-awful, shocking, abysmal, bum, rotten, pathetic, woeful, pitiful, lousy, useless, poxy, the pits

British duff, rubbish, ropy, chronic, a load of pants

vulgar slang crap, crappy, shitty

North American vulgar slang chickenshit, hellacious

archaic direful

rare egregious

ANTONYMS

excellent

3‘a diabolical liberty’

SYNONYMS

very great, extreme, excessive, undue, inordinate, immoderate, unconscionable, outrageous

uncalled for, unprovoked, intolerable, unacceptable, unreasonable, unjustifiable, unwarrantable, without justification, indefensible, inexcusable, unforgivable, unpardonable