na-adjective, noun which may take the genitive case particle 'no'
frosted; matte; non-glossy
Describes a surface finish that diffuses light and reduces shine, such as frosted glass or matte paint. Often used as a noun modifier (〜の) or adjectivally (〜な).
つや消しのガラスを使うと、外から中が見えにくくなる。
Using frosted glass makes it harder to see inside from outside.
この壁紙はつや消しの質感で落ち着いた雰
This wallpaper has a matte texture and gives a calm atmosphere.
noun, na-adjective
disillusionment; letdown; dampening of excitement
Figurative use: something that spoils a pleasant mood or shatters an idealized image. Often appears in phrases like つや消しになる or つや消しだ.
彼の一言で楽しい雰囲気がつや消しになった。
His single remark put a damper on the cheerful mood.
現実を知って、夢がつや消しになってしまった。
Learning the reality shattered my dream.
Compound of つや (luster, gloss) and 消し (erasing, from 消す). Literally 'gloss erasing', originally referring to removing shine from a surface, later extended figuratively to spoiling a mood or illusion.