na-adjective
heavy-handed; authoritarian; iron-fisted
Describes a style of governance, leadership, or action that relies on force or authority without regard for others' opinions. Often used in political or organizational contexts.
その大統領は強権的な政策を次々と打ち出した。
The president rolled out one authoritarian policy after another.
彼の強権的な態度に、部下たちは反発した。
His subordinates pushed back against his heavy-handed attitude.
高圧的 implies a domineering, oppressive manner, often in interpersonal situations, whereas 強権的 is more about institutional or political authority.
Compound of 強権 (strong authority) + 的 (-like). The exact historical derivation is uncertain, but the word is a modern Sino-Japanese formation.