# as the day is long

idiom

Source: https://englishreference.com/idiom/as-the-day-is-long
Updated: 2026-08-10

## Meaning

Unceasingly; very; thoroughly; to a very high degree.

## Examples

- He is as stubborn as the day is long.
- My grandfather is honest as the day is long, so you can trust his advice completely.
- The old lighthouse keeper was as lonely as the day is long, spending his quiet evenings watching the endless horizon.

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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.