na-adjective, noun
overbearing; domineering; high-handed
Describes a person or attitude that uses authority or power in a pushy, arrogant way. Often used with 態度 or 言い方.
彼の権柄ずくな態度には我慢できない。
I can't stand his overbearing attitude.
上司
My boss gave orders in a high-handed way.
Compound of 権柄 (けんぺい, 'power' or 'authority') and ずく (a suffix meaning 'relying on' or 'by means of'). The exact derivation of ずく is uncertain, but it may be related to 尽く (ずく, 'exhaustively' or 'entirely').