coercive; overbearing; intimidating
Describes a person, attitude, or atmosphere that pressures others through authority or forcefulness, often making them feel unable to resist.
No one could argue back against his overbearing attitude.
That boss is so intimidating that his subordinates become timid.
威張る is a verb meaning to act bossy or arrogant, often in a more personal, boastful way; 威圧的 is an adjective describing a coercive or intimidating quality.
Compound of 威圧 (intimidation, coercion) + 的 (-like, -ish). The exact historical derivation of 威圧 is uncertain, but it is conventionally associated with the meanings of its kanji: 威 (authority, dignity) and 圧 (pressure).