The Adverb of Cool: Coolly
The adverb of cool is coolly.
How coolly is formed
The adjective already ends in l. Add the full -ly ending and you get two: cool + ly = coolly.
Every adjective ending in -l behaves this way: real → really, final → finally, cruel → cruelly. The one exception is full, which drops an l to give fully.
Coolly in a sentence
| He responded coolly to the accusation. | Calmly, without visible emotion. |
| She greeted him coolly. | Here it means unfriendly rather than calm. Context decides. |
| The engine runs coolly even under load. | The literal temperature sense, which is rarer. |
The mistake to watch for
| Incorrect | Correct |
| cooly | coolly |
One l is a misspelling, not a variant. If you can see both halves of the word, cool and -ly, the spelling takes care of itself.
Related forms
Pronunciation: KOOL-lee, two syllables. Both l sounds are pronounced, which is a useful reminder that both are written.
| Adjective | cool |
| Adverb | coolly |
| Noun | coolness |
| Verb | cool (down) |
Where it is actually used
Knowing the form is one thing; knowing the company a word keeps is what makes it sound natural. These are the patterns coolly appears in most often.
| responded / reacted / received coolly | Composure under pressure, or a lack of warmth. Context decides. |
| coolly efficient / professional | Approving: calm and effective. |
| coolly dismissed / rebuffed | Disapproving: distant and unfriendly. |
Coolly or something else?
Several adverbs sit close to coolly, and the difference between them is usually meaning rather than formality.
| calmly | Only about composure. It carries none of the unfriendliness coolly can imply. |
| icily | Much stronger on the unfriendly side. Never means composed. |
| dispassionately | Formal, and specifically about setting emotion aside to judge something. |
Practice
Fill the gap, then check yourself.
- He ___ pointed out the error, unruffled.
- She ___ informed him the offer was withdrawn.
- The pilot ___ announced the delay.
Answers: 1. coolly / calmly 2. coolly (unfriendly) 3. calmly
Frequently asked
Does coolly mean calm or unfriendly?
Both, and only the sentence tells you which. Reacted coolly is usually praise for composure; greeted him coolly is almost always about a lack of warmth.
