形容詞 wasteful:

1. inefficient in use of time and effort and materials
   同義詞：uneconomical
2. tending to squander and waste
3. laying waste- Shakespeare

1. The energy shortage of the world results partly from wasteful use by the industrialized countries.
   世界能源的短缺，部分是由于工業(yè)化國家揮霍能源而引起的。
2. We must avoid wasteful duplication of effort.
   我們必須避免無謂的重復(fù)勞動。
3. Wasteful people usually end up in debt.
   揮霍浪費者最后往往負(fù)債。
4. Recklessly wasteful; wildly extravagant.
   恣意揮霍的毫不在意地浪費的; 極其奢侈的

waste.ful

adj.（形容詞）
Marked by or inclined to waste; extravagant.
浪費的：以浪費為特征或傾向于浪費的；揮霍的

【引伸】
waste.fully
adv.（副詞）
waste.fulness
n.（名詞）