uncertain

Everyday

1. Uncertain means not sure about something. tree →
2. Uncertain means not known or not decided yet. tree →
3. Uncertain weather is weather that may change suddenly. tree →

In the lessons

In stories, an uncertain character hesitates. In science, results can be uncertain when measurements are not exact. In maths, probability describes uncertain events (likely, unlikely). In everyday life: «The trip is uncertain because of the weather». Phrases: «uncertain about/of», «in no uncertain terms» (very clearly and firmly).

Examples

• I'm uncertain about which answer is right. tree →
• The weather is uncertain, so bring a coat. tree →
• The future of the old cinema is uncertain. tree →
• She gave an uncertain smile. tree →
• Whether it will rain tomorrow is uncertain. tree →
• The teacher told us in no uncertain terms to stop talking. tree →
• The number of guests is still uncertain. tree →
• Where the name came from, and what it means is very uncertain. tree →

Note

Opposite: certain, sure. Noun: uncertainty. Adverb: uncertainly. In probability, an uncertain event has a chance between 0 (impossible) and 1 (certain).