익숙하다

Meanings

trained; experienced; skilledNot bad at doing something because one did it several times before.
familiar; accustomed; habituatedNot unfamiliar but comfortable with someone or something because one has seen him/her or experienced it often.

Examples from Lessons (3)

인사 가 아직 안 익숙해서 그래.
It's just because you're not used to greeting people yet.
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아직 업무 가 익숙하지 않나?
Are you not familiar with the work yet?
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거기서 커피 를 직접 주문하는 게 아주 익숙하냐?
Are you quite used to ordering coffee in person there?
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Grammar in These Examples

-냐Level 2Casual question ending -지Level 1Sentence ending -지 않다Level 1Not -아/어서Level 2Because of, therefore