na-adjective
mysterious; enigmatic; sphinx-like; noncommittal
Describes a person, statement, or attitude that is deliberately vague, hard to read, or evasive, like the mythical nue whose true nature is unclear. Often used for someone who won't give a straight answer.
彼の返事はいつも鵺的で、本当の気持ちがわからない。
His replies are always enigmatic, so I can't tell what he really thinks.
首相の鵺的な発言に、記者たちは困惑した。
The reporters were baffled by the prime minister's sphinx-like remarks.
曖昧 means 'vague' or 'ambiguous' in a general sense, while 鵺的 specifically implies a mysterious, hard-to-pin-down quality, often with a nuance of evasiveness or deliberate obscurity.
不可解 means 'incomprehensible' or 'unfathomable,' focusing on the inability to understand, whereas 鵺的 suggests something that is puzzling because its true nature is hidden or unclear.
From 鵺 (nue, a mythical Japanese chimera said to be difficult to identify) + 的 (-teki, '-like'). The word evokes the nue's elusive, unidentifiable nature.