niminy-piminy vs mincing

niminy-piminy and mincing both are adjectives.

Word	Noun	Adjective	Verb	Adverb
niminy-piminy	No	Yes	No	No
mincing	No	Yes	No	No

As adjectives, niminy-piminy and mincing are synonyms defined as:

Other synonyms of niminy-piminy include prim, twee.

niminy-piminy (adjective)	mincing (adjective)
affectedly dainty or refined	affectedly dainty or refined