# sincerest

/sɪnsˈiəɹəst/ (UK) · CEFR B2 · Adjective

Source: https://englishreference.com/word/sincerest
Updated: 2026-10-16

## Definition

showing what you really feel in the strongest way, with no pretending.

For teachers: showing genuine feeling to the highest degree, without pretence or hidden motive.

## Examples

- She gives her sincerest thanks to all her teachers.
- He offers his sincerest apology to customers after the late delivery.
- In her farewell letter she expresses her sincerest gratitude to colleagues who supported her through difficult years.

## Synonyms

heartfelt, genuine, earnest

## Antonyms

insincere

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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.