ぐちぐちmumbling, muttering, complaining (continuously) about something

母(はは)にグチグチと文句(もんく)を言(い)われた。

I was continuously complained at by my mother. {mumbling, muttering, complaining (continuously) about something}

グチグチと不平(ふへい)ばかり言(い)う人(ひと)は嫌(きら)われます。

People who are constantly mumbling or muttering complaints are disliked. {mumbling, muttering, complaining (continuously) about something}

彼(かれ)はいつも文句(もんく)をグチグチ言(い)っていて、話(はな)しても退屈(たいくつ)だ。

He is always muttering complaints, so even talking with him is boring. {mumbling, muttering, complaining (continuously) about something}

過去(かこ)のことをグチグチとほじくり返(かえ)す彼(かれ)は未練(みれん)タラタラなのだろう。

He probably can't let go of the past, always mumbling and digging up old issues. {mumbling, muttering, complaining (continuously) about something}

何(なに)やら独(ひと)り言(ごと)をグチグチ言(い)っている彼女(かのじょ)は、何(なに)かが不満(ふまん)なのでしょう。

She, who is continually mumbling to herself, is probably dissatisfied with something. {mumbling, muttering, complaining (continuously) about something}