Not good at speaking; awkward with words — unable to express feelings or ideas well, or poor at talking in front of others.
彼は口下手で、褒められても照れて上手く返せない。
He is inarticulate; when praised he gets embarrassed and can't reply well.
面接で緊張して口べたが出てしまった。
I got nervous in the interview and my awkwardness with words came out.
口下手でも、手紙やメールで気持ちを伝えることはできる。
Even if you're poor at talking, you can express your feelings in letters or emails.
彼女は人前では口下手だが、親しい友人にはよく話す。
She's shy in public, but talks a lot with close friends.