wet behind the ears

He's young, but he may not be wet behind the ears.

At just 22, Birmingham-born Lavender was still wet behind the ears in terms of his acting career.

They were both ambitious and “wet behind the ears,” Fischer said.

But in this telling, Fry comes across as not just inexperienced but insecure: wet behind the ears, a little timid, wary of crossing lines.

He was naive, a bit wet behind the ears, but that got him the wins.