Which to use
“thicken” is a verb and “thickly” is an adverb - they look or sound alike but fill different roles in a sentence.
- #41,424
- “thicken” frequency rank
- #45,698
- “thickly” frequency rank
- 87122
- confusion score
Side-by-Side Comparison
| Feature | thicken | thickly |
|---|---|---|
| Definition | To make thicker (in the sense of wider). | In a thick manner. |
Where the spellings diverge
Shared letters are muted; the letters that actually set thicken and thickly apart are highlighted. They share 5 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: thicken is /ˈθɪkən/ while thickly is /ˈθɪkli/. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (verb vs adverb), which is usually the fastest check. Our composite confusion score for this pair is 87122, derived from the frequency rank of both members and their visual similarity.
thicken is recorded at frequency rank #41,424, classified as averb, pronounced /ˈθɪkən/. thickly is at rank #45,698, tagged as anadv, pronounced /ˈθɪkli/.
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 87122, this pair ranks #8,034 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of thicken vs thickly
Shared letters: chikt. Private to "thicken": en. Private to "thickly": ly.
"thicken" · 7 letters · shape CCVCCVC · "thickly" · 7 letters · shape CCVCCCV
Known mistypes of this pair
Frequency comparison
Frequently Asked Questions
Can "thicken" and "thickly" be used interchangeably?
Which is more common, "thicken" or "thickly"?
Remembering thicken vs thickly
The fastest way to pick the right one every time.
- Check the role first: if you need a verb, it's “thicken”; for an adverb, it's “thickly”.
- See each word in full, definition, IPA, etymology and its other confusables. Full “thicken” entry
- Browse more pairs most likely to be confused. Most confusable