Definition

Not considering or reflecting on something; acting without thought or awareness.

Example

His unthinking comments hurt her feelings.

Conversation

I can't believe he made such an unthinking decision without consulting anyone.

Right? It's like he didn't even consider the consequences.

I guess some people just act on impulse and don't think it through.

Exactly, and it usually leads to trouble later on.

Synonyms & Antonyms

Root Explanation

Unthinking → It is formed from "un-" (meaning not) and "thinking" (from Old English "þencan", meaning to think). The word "unthinking" describes a state of not thinking or acting without thought.

Memory Tip

Think of 'not' ('un-') engaging in 'thought' ('thinking') — that's why unthinking means acting without thought.

Visually Confused Words