na-adjective
dictatorial; autocratic
Describes a person, leadership style, or decision-making that is one-sided and imposes one's will on others. Often used in political or organizational contexts.
彼の独裁的なやり方にみんな反発した。
Everyone pushed back against his dictatorial way of doing things.
独裁的なリーダーシップはチームの士気を下げる
Autocratic leadership lowers team morale.
専制的 also means 'despotic' or 'autocratic', but 独裁的 is more commonly used for dictatorial rule, while 専制的 can imply absolute, often oppressive, control.
From 独裁 (dictatorship) + 的 (-like, -ic). 独裁 is composed of 独 (alone, single) and 裁 (judge, decide).