Confident About vs. Confident Of
Confident About vs. Confident Of keeps its distinction narrow and example-led, based on Cambridge’s documented complement patterns rather than a universal substitution rule.
Both confident about and confident of are documented: about can introduce a topic or situation, while of commonly introduces what someone expects or believes will happen.
Key details
Choose the right form
| Meaning / situation | Form / construction | Decision |
|---|---|---|
| a topic, task, plan, or situation is the focus | confident about + topic/situation | Use “about” for what the confidence concerns. |
| an expected result, fact, or outcome is emphasized | confident of + noun/-ing/result | Use “of” when the complement is what someone feels sure will happen or be achieved. |
| trust or assurance is placed in a person or ability | confident in + person/ability | Use “in” for the object of trust; this is a different complement pattern. |
Quick tests
Meaning / construction test
Are you naming the topic or situation that the confidence is about?
If yes: Use “confident about” for that topic or situation.
If no: If the emphasis is on an expected result, “confident of” may fit; if it is trust in a person or ability, use “confident in.”
Caveat: Cambridge documents overlapping confident + preposition patterns. Do not treat “about” and “of” as universally interchangeable or universally exclusive; choose the complement that matches the intended relation.
Examples
She is confident about the presentation.
The presentation is the topic of her confidence.
They are confident of success.
The complement names the result they expect.
I am confident in her judgment.
“In” identifies the person or capacity trusted.
Further guidance
Core difference
Cambridge lists confident about a subject or future situation and confident of an outcome such as victory or getting the needed votes.
Style Boundary
The two constructions overlap in the broad idea of certainty, so choose according to the complement and idiom of the sentence rather than enforcing a rigid rule.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- Confident (opens in a new tab)Cambridge University Press · Direct learner-dictionary evidence for confident about and confident of constructions.