for a fact
Beyond any question
For a fact emphasizes certainty or verified truth: I know for a fact she was there.
The phrase functions like "definitely" or "for certain," often introducing information the speaker claims to have confirmed personally.
It can carry a tone of correction or contradiction: That's not rumor—I know it for a fact.
Total, without qualification
- definiteClearly established, not vague
- unquestionableCannot be challenged
- undeniableImpossible to contradict
- guaranteedPromised with certainty
certain · sure · positive · conclusive · incontrovertible · irrefutable · indisputable · surefire
Demonstration of truth
- evidenceFacts supporting truth
- confirmationEstablishing something as true
- corroborationEvidence confirming another account
- documentationWritten proof or instructions
substantiation · validation · authentication · attestation · demonstration · testimony · record · data
In truth, not supposedly
- indeedWord affirming emphasis
- reallyIn actual fact
- trulyIn a genuine manner
- in truthIn accordance with facts
honestly · seriously · literally · genuinely · absolutely · positively · definitely · certainly
absolute
Total, without qualification
- definiteClearly established, not vague
- unquestionableCannot be challenged
- undeniableImpossible to contradict
guaranteed · certain · sure · positive · conclusive · incontrovertible · irrefutable · indisputable · surefire · unassailable
proof
Demonstration of truth
- evidenceFacts supporting truth
- confirmationEstablishing something as true
- corroborationEvidence confirming another account
documentation · substantiation · validation · authentication · attestation · demonstration · testimony · record · data · findings
actually
In truth, not supposedly
in truth · honestly · seriously · literally · genuinely · absolutely · positively · definitely · certainly · assuredly
for a factallegedly
Claimed but unverified
supposedly · doubtfully · perhaps · speculatively · uncertainly
for a factunconfirmed
Not officially validated
unverified · unsubstantiated · in theory · without proof · unproven
for, fact, facts, factor, factual, manufacture, artifact, manufacturing, manufactured