English Reference

Word

bonkers

US/ˈbɑŋkɝz/

UK/bˈɒŋkəz/

Definition

adj. completely crazy, silly, or wild. You use this when something or someone is acting in a very strange or funny way.

adj. mentally unbalanced or extremely foolish; characterized by wild or eccentric behavior. Often used predicatively after linking verbs like 'go' or 'be'.

Examples

“The crowd went bonkers when the band finally started playing.”

“The traffic in the city center during the holiday season is absolutely bonkers.”

“While the initial proposal seemed slightly eccentric, the final version of the plan was completely bonkers and lacked any logical foundation.”

Examples

simple

“The crowd went bonkers when the band finally started playing.”

contextual

“The traffic in the city center during the holiday season is absolutely bonkers.”

complex

“While the initial proposal seemed slightly eccentric, the final version of the plan was completely bonkers and lacked any logical foundation.”

Usage

Informal in register; frequently follows the verb 'go' to describe a sudden change in behavior.

Real-World Examples

“Catherine Zeta-Jones goes full madcap camp – and even gets to keep her native Welsh accent – in this big, bonkers crime caper about an ex-con art dealer whose past catches up with her.”
The Guardian · 26 Sept 2026

Etymology

Unknown. Perhaps from bonk (a blow or punch on the head), perhaps related to earlier bonce.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry

Level
B2 · Upper Intermediate
Frequency
Occasional
Updated

Scan code

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English Reference