油ゆ断だんのならない

expression, noun-modifying (irregular)

treacherous; dangerous; untrustworthy

Describes a person or situation that cannot be taken lightly; implies hidden danger or cunning that requires constant vigilance. Often used in warnings.

• 彼かれは油ゆ断だんのならない相あい手てだ。

  He is a treacherous opponent.

• この道みちは夜よるになると油ゆ断だんのならない場ば所しょになる。

  This road becomes a dangerous place at night.