Say "I don’t know" when you genuinely don’t

Admitting the limits of your knowledge signals intellectual honesty and raises long-term credibility.

Why it works

Overclaiming — asserting certainty you don’t have — is detectable: receivers sense the bluff, which erodes trust in everything else you say. "I don’t know, but I’ll find out" preserves epistemic trustworthiness, and people calibrate their confidence in a source based on its track record of knowing when it doesn’t know.

How to do it

1. When asked something outside your genuine knowledge, say: "I don’t know — let me find out."
2. Distinguish between what you know well, what you believe but could be wrong about, and what you have no basis to claim.
3. Follow up with the answer when you have it — the follow-through is what converts honesty into reliability.

Evidence

Source credibility research consistently shows that calibration — the match between a source’s confidence and its accuracy — predicts long-term trustworthiness ratings. Sources that acknowledge uncertainty in low-knowledge domains are trusted more on their high-confidence claims. (observational)

Most calibration research is in forecasting/judgment contexts; generalization to interpersonal communication dynamics is principled but less directly studied.

Sources

• Griffin & Tversky (1992), the weighing of evidence and the determinants of confidence, Cognitive Psychology

Common mistake

Saying "good question" as a stall, which everyone recognizes — it produces more suspicion than a direct acknowledgment of not knowing.