Serious (adjective) — جدي أو مُهم أو يتطلب اهتماماً كبيراً ومُعاملة حذرة: Requiring careful thought; important or grave. Below are 7 words with a similar meaning; the linked ones have full GL Dictionary entries with their meaning in Arabic.
Showing sincere and serious intention or conviction; characterized by deep, genuine purpose; as a noun, money given as a pledge or token of good faith
Formal and dignified; serious.
Important enough to have a noticeable effect; statistically meaningful.
graveimportantseverecritical
Sharp or severe in effect; of an illness, sudden and intense; of a mind, quick and penetrating.
Involving great risk or important consequences.
Very unpleasant or unkind; also serious or dangerous.
Very great or intense; also showing deep insight.
Not drunk; serious and sensible.
Heavy; serious and important.