不ふ変へん化かふへんかMeanings1noun which may take the genitive case particle 'no'indeclinablegrammarGrammar term for words that do not inflect, such as particles, adverbs, and conjunctions in Japanese.日本にほん語ごの助じょ詞しは不ふ変へん化かの品ひん詞しです。Japanese particles are indeclinable parts of speech.