na-adjective
Describes an atmosphere, ceremony, or demeanor that is dignified, weighty, and free of levity. Often used for formal occasions, memorials, or serious declarations.
式典は厳粛な雰囲気の中で行われた。
The ceremony was held in a solemn atmosphere.
彼は厳粛な面持ちで結果を報告した。
He reported the results with a grave expression.
na-adjective
Used for truths, realities, or judgments that are severe, unyielding, or difficult to accept. Less common than the solemn sense; often collocates with 現実 (reality) or 事実 (fact).
厳粛な現実を受け止めなければならない。
We must accept the harsh reality.