resistless vs unresisting

resistless and unresisting both are adjectives.

Word	Noun	Adjective	Verb	Adverb
resistless	No	Yes	No	No
unresisting	No	Yes	No	No

As adjectives, resistless and unresisting are synonyms defined as:

resistless and unresisting: offering no resistance, passively accepting of a situation

resistless (adjective)	unresisting (adjective)
impossible to resist; overpowering	offering no resistance, passively accepting of a situation
offering no resistance, passively accepting of a situation