vague; ambiguous
Example sentences
彼の曖昧な返事は、なおさら彼女をいらいらさせた。
His ambiguous reply made her all the more irritated.
彼の論文は意味不明。第一、主題が曖昧だ。
His thesis doesn't make sense. To begin with, its theme is obscure.
私にはその意味がいまだに曖昧だ。
The meaning is still obscure to me.