green as a gooseberry

Very young, immature, and/or inexperienced. Are you sure he's fit to run your campaign? He's just out of college and still as green as a gooseberry!

Name	Pronounced	Usage
Mi-Gyeong	mee-gyung	Korean
Goodrich	['gud.ritʃ]
Saturn	SA-tərn (English)	Roman Mythology (Anglicized)
AntÓNio	-	Portuguese
Lorraine	[ləu'rein]
Jodi	JO-dee	English