moonish
/ˈmuːnɪʃ/adjective
Resembling or belonging to the moon; round like the full moon. Also: †influenced by the moon; acting as if so influenced, changeable, fickle (obsolete ).
Origin
Late Middle English; earliest use found in John Lydgate (c1370–c1449), poet and prior of Hatfield Regis. From moon + -ish.