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What is another word for serious?

What's another word for serious? | Here's a list of synonyms for serious.

Definition 1: concerned with work or important matters rather than play or trivialities - [adjective denoting all]

Definition 1: completely lacking in playfulness - [adjective denoting all]

Definition 1: causing fear or anxiety by threatening great harm - [adjective satellite denoting all]

Definition 1: requiring effort or concentration; complex and not easy to answer or solve - [adjective satellite denoting all]

Definition 1: of great consequence - [adjective satellite denoting all]

Definition 1: appealing to the mind - [adjective satellite denoting all]