be as honest as the day is long

To be very truthful and reliable. Tom is as honest as the day is long—if he promised to help you move, then he'll be here. Kate would never cheat on an exam—she's as honest as the day is long.

Common Names:

Name	Pronounced	Usage
Cecily	SES-i-lee	English
Ava	['avə]
İLhan	-	Turkish
Lisa	LEE-sə (English), LEE-zah (German), LEE-sah (Dutch)	English, German, Dutch, Swedish, Norwegian, Danish, Italian
Etelka	-	Hungarian
Shun (1)	-	Chinese