unmusical

His singing voice was loud and unmusical, causing the audience to cringe.

(Chinese) 他的歌声洪亮却不悦耳，让听众感到难受。

The clatter of falling pots and pans made a very unmusical sound.

(Chinese) 锅碗瓢盆掉落的叮当声发出了一种极不悦耳的声音。