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Douglas Harper's Etymology Dictionary
hellacious

1930s, college slang, from hell + fanciful ending (see bodacious).

Wiktionary
hellacious

a. nasty, repellent

Usage examples of "hellacious".

A few Wolfs, their eyes alternately bulging with terror and glaring with hellacious rage, had joined them.

This gives them a hellacious throughput, but their mag bottle technology's cruder than ours, and it takes an extremely dense field.

What he did know was that the armored personnel carrier next to them, with eight soldiers and three crew members, had suddenly become a blazing, hellacious funeral pyre.

Anyway, they're in some hellacious firefight charging up Pork Chop Hill or wherever, the Commies are kicking their living ass, and Brendan looks around and some Chink jumps out of a bush and just about empties his rifle in Rollo.

Hell, I even saw one shop that uses tidal catcher basins to drive wheels with the outflowthey've got two moons, and that makes for some hellacious tides even on an inland sea like the K'Vaernian.

Hell, I even saw one shop that uses tidal catcher basins to drive wheels with the outflow-they've got two moons, and that makes for some hellacious tides even on an inland sea like the K'Vaernian.

My grandboy, Willie, named for me, he seen this hellacious big motor yacht laying up off Dog Island when we was out last Thursday.

A hellacious roar ensued as the determined janitors sprayed several thousand rounds per minute out the door.

Beyond range of the bombards' hellacious recoils stood stacks of four to five of the granite balls which were the heaviest things that the weak-walled tubes would throw, even charged with the weak serpentine powder that had to be mixed on the spot to the individual requirements of each bombard.