WordGarden.iobrainer
A1Pronunciation
UK
US
- /ˈbreɪnər/
Meanings
Noun
(informal)a person characterized by a specified style of thinking, used chiefly in compounds
Beyond the definition
A brainer is an informal noun tied to thinking or mental effort — but you will almost always see it inside the expression "no-brainer." A no-brainer is something so obvious or easy that it needs almost no thought. If a new laptop costs half the price and works better, choosing it might be a no-brainer.
Used alone, brainer sometimes appears playfully to describe something that does require thought, like a tricky problem or a challenging decision. For example, someone might say, jokingly, "That's a real brainer," meaning it needs serious mental effort. However, this standalone use is rare and sounds informal or humorous.
The word brainer comes from brain, suggesting something related to thinking or intellectual effort. In modern English, it rarely functions as a common independent word. Instead, it survives mainly as part of the idiomatic compound no-brainer, which became popular in American English during the 20th century.
When something is described as a no-brainer, the speaker implies that the answer or decision is immediately obvious — almost automatic. For example: "Accepting the scholarship was a no-brainer," or "Upgrading the system for better security is a no-brainer." The phrase often conveys confidence, practicality, and efficiency in decision-making.
Outside this fixed expression, brainer may appear in informal or playful speech as the opposite idea — something that actually requires thinking. Saying "That's a brainer" can humorously suggest a puzzle, dilemma, or mentally demanding task. However, this usage is uncommon and may sound unusual compared to more natural alternatives like brain-teaser, challenge, or tough decision.
Context matters greatly. In everyday conversation, no-brainer is widely understood and acceptable, especially in casual speech. In formal writing, however, it can sound too conversational, so writers often replace it with phrases like an obvious choice, a straightforward decision, or self-evident solution.
So while brainer technically exists as a word, its real use is mostly tied to the idiom no-brainer — a vivid expression capturing the idea of a decision that nearly makes itself.
Examples
- 1
Easy choice
At that price, buying the yearly pass was a no-brainer.
- Phrasea no-brainer
an easy choice that needs little thought
- 2
Work decision
For Mia, taking the job with better hours was a no-brainer.
- 3
Hidden costs
It looked like a no-brainer at first, but the hidden fees changed our minds.
See also
Similar
- thinker
- intellectual
- brainiac
Shades of meaning
Contrast
Do not confuse
- no-brainer
Word family
Explore
Forms and spellings
1 form open this card.
Main spelling
- brainer