What is another word for hellacious?

Need synonyms for hellacious? Here's a list of words from our thesaurus that you can use instead.

Adjective
Extreme in degree, power, or effect
“… the hellacious heat was more than we could bear.”
Adjective
Requiring considerable physical or mental effort
“… the pioneers survived a particularly hellacious river crossing with their covered wagon barely in one piece.”
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