na-adjective
uncertain; vague; ambiguous; non-committal
Describes something that is unclear, indefinite, or lacking firmness, such as a memory, statement, attitude, or situation. Often used for evasive or wishy-washy responses.
彼の返事はあやふやで、本当に行くのかわからない。
His reply was vague, so I don't know if he's really going.
あの日の記憶はあやふやだ。
My memory of that day is hazy.