Which to use
“steadfast” is an adjective and “steadfastly” is an adverb - they look or sound alike but fill different roles in a sentence.
- #24,323
- “steadfast” frequency rank
- #42,424
- “steadfastly” frequency rank
- 66747
- confusion score
Side-by-Side Comparison
| Feature | steadfast | steadfastly |
|---|---|---|
| Definition | Fixed or unchanging; steady. | In a steadfast manner; firmly; with conviction |
Where the spellings diverge
Shared letters are muted; the letters that actually set steadfast and steadfastly apart are highlighted. They share 9 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
These two trip readers on the page rather than in the ear: steadfast is /ˈstɛdfɑːst/ while steadfastly is /ˈstɛdfɑːstli/. Spoken aloud the problem disappears. In writing it persists, because they differ by 2 extra letter(s) - “steadfast” sits inside “steadfastly”, and the parts of speech differ too (adjective vs adverb), which is usually the fastest check. Our composite confusion score for this pair is 66747, derived from the frequency rank of both members and their visual similarity.
steadfast is recorded at frequency rank #24,323, classified as anadj, pronounced /ˈstɛdfɑːst/. steadfastly is at rank #42,424, tagged as anadv, pronounced /ˈstɛdfɑːstli/.
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 66747, this pair ranks #66,589 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of steadfast vs steadfastly
Shared letters: adefst. Private to "steadfast": -. Private to "steadfastly": ly.
"steadfast" · 9 letters · shape CCVVCCVCC · "steadfastly" · 11 letters · shape CCVVCCVCCCV
Known mistypes of this pair
- steadfast ← setadfast · ssteadfast · staedfast · steadafst · steaddfast · steadfasst · steadfastt · steadfats
- steadfastly ← setadfastly · ssteadfastly · staedfastly · steadafstly · steaddfastly · steadfaslty · steadfasstly · steadfastlly
Frequency comparison
Frequently Asked Questions
Can "steadfast" and "steadfastly" be used interchangeably?
Which is more common, "steadfast" or "steadfastly"?
Remembering steadfast vs steadfastly
The fastest way to pick the right one every time.
- Check the role first: if you need an adjective, it's “steadfast”; for an adverb, it's “steadfastly”.
- See each word in full, definition, IPA, etymology and its other confusables. Full “steadfast” entry
- Browse more pairs most likely to be confused. Most confusable