adverb
- in a way that can be officially verified or confirmed
- to such an extreme degree as to seem mentally unstable
Usage: informal
Examples
- The diamond was certifiably authentic according to the gemologist’s report.
- Her test scores were certifiably the highest in the district.
- The building is certifiably safe after passing all inspections.
- He was acting certifiably crazy during the meeting.
- The company’s profits are certifiably higher than last year.
- She seemed certifiably obsessed with collecting vintage postcards.