not reliable; reckless (describing a person's behavior)
Definitions (粵典–words.hk)
形容詞
形容做事態度求其、唔認真、唔負責任，好似細路仔玩泥沙咁 frivolous; not earnest; irresponsible; childish (in terms of responsibility); not taking a serious attitude when working on an important task; literally: "child's play"
呢件事好重要，唔可以咁兒戲。
呢件事好重要，唔可以咁儿戏。
ni1 gin6 si6 hou2 zung6 jiu3, m4 ho2 ji5 gam3 ji4 hei1. This is an important matter. We can't act frivolously.
你對愛情咁兒戲，我好難同你行落去喎。
你对爱情咁儿戏，我好难同你行落去㖞。
nei5 deoi3 oi3 cing4 gam3 ji4 hei1, ngo5 hou2 naan4 tung4 nei5 haang4 lok6 heoi3 wo3. You are so irresponsible when it comes to love. It's so hard for me to continue my relationship with you.
形容詞
形容物件整得唔硬淨，好易爛 poorly made; fragile; liable to break
張櫈咁兒嬉㗎，一坐就冧！
张櫈咁儿嬉㗎，一坐就冧！
zoeng1 dang3 gam3 ji4 hei1 gaa3, jat1 co5 zau6 lam3! This chair is so fragile. It collapses as soon as anybody sits on it.