horrible, awful, hellish, agonizing, difficult.
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(slang) Remarkable, unbelievable, unusual.
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nasty, repellent.
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Add your own interpretation of "hellacious".
Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.