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bad idea

bad idea

246 2.3
A choice or plan that will probably cause problems
  • noun
translation icon : mala idea
  • Deciding to skip the meeting was a bad idea that cost us the project.
  • seem like a bad idea
  • a very bad idea
  • say it's a bad idea

Well, that could be a bad idea or a really bad idea.

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Examples

  • This is such a bad idea, you guys.

  • You know the facts, and you know it's a bad idea to smoke.

    Academic text (2010)
  • OK, that sounds like a bad idea, right?

  • So we have to fight bad ideas with good ideas.

  • Well, that could be a bad idea or a really bad idea.

  • The same place most bad ideas come from, the Internet.

  • The way to fight bad ideas is with good ideas.

  • I still say this is a bad idea.

  • "We thought it was a bad idea to date since we work together."

    Fiction book (1997)
  • So this seems like a bad idea, like it gets us nowhere.

Synonyms

bad decision
vsbad idea
54 2.4

A choice that is not good and causes problems later

is broader and also applies to plans and suggestions
poor decision
vsbad idea
11 3.5

A choice that is not wise and causes problems

is more general and covers choices, plans, and suggestions
stinker of an idea
vsbad idea
  • Informal
7.5

A very bad idea

is used more generally for any unwise choice or plan
cockbrained idea
vsbad idea
  • Archaic
9.9

A foolish idea that probably will not work

is broader and refers to likely negative results rather than mere absurdity
non-starter
vsbad idea
  • Informal
6.7

An idea or plan that has no chance of success

is about being unwise or likely harmful rather than only impossible to succeed

How Unwise

bad idea
246 2.3
questionable
176 3.9

Surface Forms

bad idea singular
bad ideas plural

Morphology

bad + idea

The meaning 'an unwise or ill-advised suggestion/choice' is directly and predictably derived from combining 'bad' (not good) with 'idea' (suggestion/plan); the adjective simply negates the quality of the noun. This adjectival-noun composition is cross-linguistically common and follows basic semantic rules, so a B1 learner who knows both constituents will readily understand the phrase.

Etymology

The phrase bad idea comes from calling an idea 'bad' when it will cause trouble. So, it now means a choice or plan that is 'unwise' or likely to cause problems.