certainty

n. /ˈsɜːrtnti/ B1

确定；确信

The state of being completely confident or sure.

仙境例句

The Caterpillar said with certainty that Alice would get used to her size in time.

毛毛虫很有把握地说，爱丽丝过些时候就会习惯自己的身高了。