N4 — outside your level filter
Is said whole, with nothing composed onto it and takes no だ／です, so there are no forms to conjugate.
悪口を言う
waruguchiwoiuto talk behind someone's backN4expression
Example sentences2
人の悪口を言うのはよくないです。
hito no waruguchi o iu no wa yokunai desu.
Talking behind people's backs isn't good. neutral
陰で悪口を言うの、やめようよ。
kage de waruguchi o iu no, yameyou yo.
Let's stop talking behind people's backs. casual