serious

UK: ˈsɪəriəs | US: ˈsɪriəs

Definition

  1. adj. 1. grave or solemn in manner or character

  2. adj. 2. requiring careful consideration; important

  3. adj. 3. sincere and earnest (e.g., a serious promise)

Structure
seri <weighty, grave (from Latin *serius*)>ous <adjective suffix>
Etymology

The word "serious" traces back to the Latin serius, meaning "weighty" or "grave." It entered Middle English via Old French serieux, retaining its core sense of solemnity and importance. The suffix -ous (from Latin -osus) denotes "full of" or "having the quality of," reinforcing the adjective form. Over time, "serious" expanded to encompass sincerity and earnestness, reflecting its enduring association with depth and significance.

Examples

  1. She gave a serious speech about climate change.

  2. The doctor wore a serious expression while reviewing the test results.

  3. This is a serious matter that requires immediate attention.

  4. He made a serious effort to improve his grades.

  5. Are you serious about moving abroad next year?