Definition

Not able to be trusted or relied upon; someone or something that is unreliable.

Example

I found him to be an undependable friend who often canceled our plans at the last minute.

Conversation

I can't believe you still trust him with your plans.

I know, but I thought he would change.

He has always been so undependable in the past.

You're right; I should probably stop relying on him.

Synonyms & Antonyms

Root Explanation

Undependable → It is formed from "un-" (meaning not) and "dependable" (from Latin "dependere", meaning to hang from or rely on). The word "undependable" means not able to be relied upon or trusted.

Memory Tip

Think of 'not' ('un-') being added to 'rely on' ('dependable') — that's why undependable means someone or something you cannot trust.

Visually Confused Words