whimsical

1. ADJ A whimsical person or idea is unusual, playful, and unpredictable, rather than serious and practical. 異想天開(kāi)的

McGrath remembers his offbeat sense of humour, his whimsical side. 麥格拉思記得他非同尋常的幽默感，和他異想天開(kāi)的一面。