# nebulous

/ˈnɛbjəɫəs/ (US) · /nˈɛbjʊləs/ (UK)

Source: https://englishreference.com/word/nebulous
Updated: 2026-08-27

## Senses

### 1. vague or unclear

adjective · CEFR C1 · Academic · Formal

not clear or specific; difficult to describe or understand exactly.

For teachers: lacking definite form, limits, or content; vague or ill-defined in a conceptual sense.

- The company had some nebulous plans for the future, but nothing was written down.
- The candidate's platform remained nebulous throughout the campaign, frustrating voters who wanted specific policy proposals rather than broad rhetoric.

Usage: Commonly used to describe abstract concepts like ideas, plans, or memories.

### 2. cloudy or hazy

adjective · CEFR C2 · Literary · Technical

looking like a cloud or a mist; not having a sharp edge.

For teachers: resembling a cloud or haze; lacking a clearly defined physical outline.

- A nebulous glow appeared in the sky just before the storm started.
- Through the telescope, the scientist observed a nebulous mass of gas and dust where new stars were beginning to form.

Usage: Often used in scientific contexts or descriptive literature to describe light or distant objects.

### 3. relating to space nebulae

adjective · CEFR C2 · Technical

related to a nebula, which is a giant cloud of dust and gas in space.

For teachers: pertaining to or having the characteristics of a nebula.

- The astronomer spent years studying nebulous gases in the Orion constellation.
- The paper discusses the chemical composition of various nebulous structures found within the Milky Way.

Teaching tip: This is the most literal and technical sense of the word; most learners will encounter the 'vague' sense more frequently in general reading.

## Examples

- The future of the company remains nebulous.
- The artist's style is so nebulous that critics struggle to place it within any specific historical movement.
- While the initial goals of the project were nebulous, the final report provided a clear roadmap for the next fiscal year, much to the relief of the board members.

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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.