bare-knuckled vs bare-knuckle

bare-knuckled and bare-knuckle both are adjectives.

Word	Noun	Adjective	Verb	Adverb
bare-knuckled	No	Yes	No	No
bare-knuckle	No	Yes	No	No

As adjectives, bare-knuckled and bare-knuckle are synonyms defined as:

bare-knuckled and bare-knuckle: characterized by disorderly action and disregard for rules

Other synonyms of bare-knuckled include rough-and-tumble.

bare-knuckled (adjective)	bare-knuckle (adjective)
characterized by disorderly action and disregard for rules	characterized by disorderly action and disregard for rules