heavy responsibility; grave duty
Refers to a serious, weighty obligation or duty, often in professional, public, or leadership roles. Carries a formal tone.
He fulfilled his heavy responsibility as company president.
That position comes with great responsibility.
The new president bears the heavy responsibility of shaping the company's future.
He shoulders the heavy responsibility of leading the team to victory.
She fulfilled her heavy responsibilities as minister.
He quit the company as if to escape from his heavy responsibilities.