HSK 2
不好意思
bù hǎoyìsito feel embarrassed; to find it embarrassing; to be sorry (for inconveniencing sb)
不好意思，我来晚了。
Bù hǎoyìsi, wǒ lái wǎn le.
Sorry, I arrived late.
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New in the HSK 3.0 word list at level 2.