0 Someone, especially a young person, who is callow behaves in a way that shows they have little experience, confidence, or judgment:
The absence of recently built work has provoked such callow comments as 'he didn't really want to build' or 'he didn't really like buildings'.
The callow and shallow youth might well judge the portly middle-aged man he will become to be better off dead, but think differently when he himself is living this reality!
They employ callow youths, they cause the little ones to stumble.
To what extent is a man of 68 the same person as the callow youth of 18 that he once was?
I do not know whether it is callow carping or an opportunistic attempt to take advantage of every grievance that exists.
A callow and rather childish reference to somebody's speech is not a point of order.
We do not say that people should come here as callow apprentice politicians and nothing else.
I believe that it was a rather callow remark that was made, and that it would have been better unsaid.