形容詞 laputan:

1. relating to or characteristic of the imaginary country of Laputa or its people
2. not practical or realizable; speculative
   同義詞：airy, impractical, visionary, windy

La.pu.tan

adj.（形容詞）
Absurdly impractical or visionary, especially to the neglect of more useful activity.
異想天開的：極端不切實際的或異想天開的，特別是指否定更有用的行為的

來源：
After the flying island of Laputa in Gulliver`s Travels by Jonathan Swift, where absurd projects are pursued and useful pursuits neglected.
源自 Laputa 的飛島，在 格列佛游記 中，喬納森·斯威夫特著，在那里人們追逐著極端不切實際的目標而放棄有用的目標

【引伸】
Lapu.tan
n.（名詞）