Definition

Describing something that is not stable and can change or fall apart easily.

Example

The instable structure of the old building made it dangerous to enter.

Comparatives & Superlatives

Conversation

I heard that the weather is really instable this week.

Yeah, it keeps changing every few hours.

I hope it doesn't affect our plans for the weekend.

Me too! We need some stable weather for that.

Synonyms & Antonyms

Root Explanation

Instable → It is formed from "in-" (meaning not) and "stabilis" (from Latin, meaning stable or fixed). The word "instable" means not stable or lacking stability.

Memory Tip

Think of 'not' ('in-') being added to 'stable' — this helps you remember that 'instable' means something that is not stable.

Visually Confused Words