dì / di / mēn / shēng / mēn / qì / de / huí / dá / le / jǐ / jù / kàn / qǐ / lái / xīn / qíng / hěn / bù / hǎo

弟弟闷声闷气地回答了几句，看起来心情很不好。

My younger brother answered in a low, muffled voice and seemed to be in a bad mood.