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vague; ambiguous; unclear
shady; disreputable
fuzzy
彼の答えは曖昧で何を言いたいのか分かりにくい。
His answer is ambiguous and hard to understand.
曖昧な表現を使うと相手に誤解を招きやすい。
Ambiguous expressions easily cause misunderstandings.
曖昧な態度を取り続けると周囲の信頼を失わせる。
An ambiguous attitude causes loss of trust.