اسراف ، اسراف کردن ، ریخت و پاش

Question

اسراف کردن کار خوبی نیست .
نباید اسراف کرد بلکه باید صرفه جویی کرد

Answer 1

 

Squander/squandering اسراف-اسراف کردن

Extravagance ریخت و پاش

Answer 2

عاشق has already suggested good words. In addition, sometimes you can simply use 'waste' as the opposite of 'save'.

Save water. Don't waste it.

Stop wasting food. Cut back on what you toss by buying as much as you need.

If you'd like to add some religious spice to it you could say,

Waste not by extravagance.

Which I found here: 

http://www.comp.leeds.ac.uk/nora/html/7-31.html

'Conserve' also can work sometimes but it's mostly used for natural resources. It means 'use as little water, energy, etc so it's not wasted.'

'the need to conserve energy'

http://www.ldoceonline.com/dictionary/conserve