too big for one's breeches vs persnickety

too big for one's breeches and persnickety both are adjectives.

Word	Noun	Adjective	Verb	Adverb
too big for one's breeches	No	Yes	No	No
persnickety	No	Yes	No	No

As adjectives, too big for one's breeches and persnickety are synonyms defined as:

too big for one's breeches and persnickety: (used colloquially) overly conceited or arrogant

Other synonyms of too big for one's breeches include bigheaded, snooty, snot-nosed, snotty, stuck-up, uppish.

too big for one's breeches (adjective)	persnickety (adjective)
(used colloquially) overly conceited or arrogant	characterized by excessive precision and attention to trivial details
	(used colloquially) overly conceited or arrogant