Is “Mimsy” a Scrabble word?
Yes
MIMSY
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Mimsy
/ˈmɪmzi/
adjective
1.A nonce word in Lewis Carroll's Jabberwocky combining the senses of "flimsy" and "miserable".