# certainly

> English word · Adverb · IPA /ˈsɜː.tn̩.li/ · frequency rank #1,069

## Definitions
1. In a way which is certain; with certainty.
2. Without doubt, surely.
3. An emphatic affirmative answer; of course.

## Etymology
From Middle English certeynly; equivalent to certain + -ly.

## Easily confused with
- **certainty** (https://plainspell.com/en/vs/certainly-vs-certainty)
- **certain** (https://plainspell.com/en/vs/certain-vs-certainly)

## Common misspellings (14)
`ccertainly`, `ceratinly`, `cerrtainly`, `certailny`, `certainlly`, `certainlyy`, `certainnly`, `certainyl`, `certanily`, `certianly`, `certtainly`, `cetrainly`, `cretainly`, `ecrtainly`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/certainly