# dumb

/ˈdəm/ (US) · /dˈʌm/ (UK)

Source: https://englishreference.com/word/dumb
Updated: 2026-06-19

## Senses

### 1. stupid or foolish

adjective · CEFR A2 · Informal

stupid or silly.

For teachers: lacking intelligence or common sense. Highly informal and often derogatory.

- That was a dumb mistake, and I should have checked the map first.
- It was a remarkably dumb decision to ignore the safety warnings, especially given the high stakes of the project.

### 2. not smart (technology)

adjective · CEFR B2 · Technical

describes a machine or tool that does not have its own computer brain or 'smart' features.

For teachers: lacking independent processing power or autonomous 'intelligent' capabilities; often contrasted with 'smart' devices.

- I prefer using a dumb phone because it has fewer distractions than a smartphone.
- The system relies on dumb terminals that simply display data processed by a central mainframe server.

### 3. unable to speak

adjective · CEFR C1 · Archaic

unable to speak; this is an old-fashioned word that some people now find offensive.

For teachers: physically unable to speak. This sense is increasingly avoided in modern clinical contexts in favour of 'mute'.

- In the old story, the prince was struck dumb by a magic spell.
- The historical documents refer to the patient as 'deaf and dumb', a terminology that has since been replaced by more sensitive descriptors.

Teaching tip: This sense is mostly found in literature or old films. In modern conversation, using 'dumb' to mean 'unable to speak' can be seen as insensitive or offensive.

### 4. to make simpler

verb · CEFR B2 · Informal

to make something easier to understand, often in a way that makes it less intelligent.

For teachers: to simplify something to the point of reducing its intellectual level. Usually used with 'down'.

- The news often dumbs down complex stories to make them more popular.
- Critics argued that the new curriculum would dumb down the subject matter and fail to challenge the more advanced students.

Usage: Almost always used as the phrasal verb 'dumb down'.

### 5. extremely

adverb · CEFR C1 · Slang · American English

used to mean 'very' or 'extremely' to emphasize an adjective.

For teachers: used as an intensifier meaning 'extremely' or 'very'.

- That new video game is dumb hard to finish.
- The exam was dumb easy, so I finished it with twenty minutes to spare.

## Examples

- My old phone is a dumb phone.
- In a secure facility, employees might use a dumb terminal that only connects to a central server.
- While smart homes are becoming standard, there's a growing market for 'dumb' appliances that perform a single function reliably without needing software updates or an internet connection.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.