手を付けずダラダラしているくせに、「うへー、今度こそ間に合わないかも！？」と心はビクビクしている。

Despite having lazed around without having touched my work I'm frightened at heart that "Ooh-er, this time I might really not get done in time!?"

ただでさえ奴は普段から仕事に遅れて来るくせに、酒まで飲んで来るなんて堪忍袋の緒が切れた。もう会社を辞めてもらうしかない。

It was bad enough that he usually came to work late, but coming in drunk was the last straw, and I'm going to have to let him go.

彼は太っているくせに声は細い。

His voice is thin even though he is fat.

新米のくせに大きな顔をするな。

Act your place.

青二才のくせに何を言うか。

That's big talk for an upstart like you.

日本語のニュアンスが分からないくせに、自分の辞書のほうが正しいと言い張る傲慢な毛唐だ。

You're an arrogant dirty foreigner who claims your dictionary is correct even though you don't understand the nuances of Japanese.

最近は、年下のくせにため口を聞く奴が多すぎる。

These days more and more young people talk to their elders on even terms.