threatening; menacing
Describes an attitude, action, or atmosphere that is intended to intimidate or convey a threat. Often used in formal or written contexts.
People around him were frightened by his threatening attitude.
That country conducted menacing military exercises against its neighbor.
Formed from 威嚇 (intimidation) + 的 (-like, -ish). The exact historical derivation is uncertain, but the word follows a common pattern for creating adjectival nouns from nouns.