short letter
Noun
Meaning
a short personal letter
Source: WordNetSynonyms
Hypernyms
Hyponyms
Examples
A fan sent me a letter and a $10 bill. It's a short letter - all she said was, "Hey, since it's harder for you to go out these days without getting photographed, here $10 for a pizza." I was like, "Aww, she sent me money for a pizza so I could eat at home!"
A short letter to a distant friend is, in my opinion, an insult like that of a slight bow or cursory salutation -- a proof of unwillingness to do much, even where there is a necessity of doing something.
drop me a line when you get there