noun-modifying (irregular)
Describes speech, behavior, or atmosphere that is rigidly formal, stiff, or overly proper. Often carries a slightly negative nuance of being unnatural or lacking warmth.
See also: 形式張る
彼の形式ばった挨拶にはいつも緊張してしまう。
I always get nervous at his stiff, formal greetings.
形式ばった会議よりも、ざっくばらんな話し合いのほうがいい。
I prefer a frank discussion over a formal, stiff meeting.
From the verb 形式張る (けいしきばる), literally 'to stretch formality', combining 形式 (formality) and 張る (to stretch/stiffen). The prenominal form 形式ばった is used as an adjective.