Guide 121 / 200 5 swaps Formal register
Professional words for “sure”
Five words that register conviction differently.
i · When it mattersTwo lines, no filler
"Sure" is conversational. "Certain" is firm; "confident" is earned; "convinced" is moved by argument; "positive" is emphatic; "assured" is formal, often of outcomes.
ii · The swaps5 ways
- 01Certain neutral
firm, admitting no doubt
Certain of the figures for Q1.
- 02Confident neutral
earned conviction
Confident in the rollout plan.
- 03Convinced neutral
persuaded by evidence or argument
Convinced by the pilot results.
- 04Positive neutral
emphatic personal certainty
I’m positive the email came from her.
- 05Assured formal
outcome is guaranteed
Assured of regulatory sign-off.
iii · And what not to sayKeep this one
"I’m 100% sure" reads as over-reach. Prefer "confident" unless you can genuinely stand behind certainty.