形容詞 impractical:

1. not practical; not workable or not given to practical matters
2. not practical or realizable; speculative
   同義詞：airy, visionary, Laputan, windy

1. One who is unrealistic and impractical; a visionary.
   空想家不現(xiàn)實(shí)和不實(shí)際的人; 幻想者
2. The plan is feasible in reason but impractical.
   這個(gè)計(jì)劃道理上行得通，但不現(xiàn)實(shí)。
3. The ideals or principles of a utopian; idealistic and impractical social theory.
   烏托邦思想及理論空想社會(huì)主義者的理想或原則; 理想但不切實(shí)際的社會(huì)主義學(xué)說(shuō)

im.prac.ti.cal

adj.（形容詞）
Unwise to implement or maintain in practice:
不切實(shí)際的；不現(xiàn)實(shí)的：不明智地堅(jiān)持或?qū)嵭械模?/br>例句：
Refloating the sunken ship proved impractical because of the great expense.
打撈沉船由于費(fèi)用巨大而顯得不切實(shí)際

Incapable of dealing efficiently with practical matters, especially finances.
不實(shí)用的：不能有效處理實(shí)際事務(wù)的，特別是對(duì)財(cái)政事務(wù)
Not a part of experience, fact, or practice; theoretical.
理論的：不屬于經(jīng)驗(yàn)、事實(shí)或?qū)嶋H的；理論上的
Impracticable.See Usage Note at impracticable
行不通的參見(jiàn) impracticable

【引伸】
imprac.tical.ity