不ふ変へん性せいMeaningsNoun1. invarianceKanji used不negative変change性nature (of a person)Pitch accentふへんせいComposed of不ふ変へんeternal; everlasting; unchangeable; immutable; immovable; constant; permanent; indestructible; invariantNa-adjective性せいnature (of a person); sex; gender; sex (i.e. sexual attraction, activity, etc.); -ty; -ity; -ness; -cyNoun