This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. One who mopes or is inclined to do so.

"He added 20 pounds, gained confidence -- "From 'moper' to monster," one N&O headline read -- and gave the Pack another inside threat to go with Marcus Melvin."