My wife saw this yesterday in a TV commercial for Outback Steakhouse.

Problem:
The restaurant chain used an adjective where an adverb was required.

Explanation:
Outback Steakhouse now has “Live Adventurous.” as one of its advertising slogans, as my wife saw yesterday in a television advertisement from the chain.

The word “adventurous” is an adjective.

Adjectives modify nouns, not verbs, but Outback is using “adventurous” to modify a verb (“Live”).

Outback is trying to tell the viewer how to live.

This requires an adverb.

Many adjectives can be converted to adverbs by appending the L-Y suffix.

“Adventurous” is one of those adjectives.

This gives us the solution.

I suppose that Outback and its advertising firm were trying to be catchy or edgy by using an adjective where an adverb was required.

But I view this grammatical mistake as encouraging the decline of the distinction between adjectives and adverbs.

Solution:
“Live Adventurously.”