1. Causing waste; expending that which is valuable without necessity or use; lavish; prodigal: destructive; ruinous.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• tastful,
• wastfull,
• waistful,
• disteful,
• wastful,
• wastefull,
• wastefule,
• wandeful,
• casketful,
• kaseful,
• fasteful,
• masteful,
• waseteful,
• wastfeful,
• wasetful,
• wasteeful,
• rageeful,
• wastcevil,
• Gastfule,
• Gafstful

• waste pipe,
• wastebin,
• wastefully.

The adjective form of the word "wasteful" is "wasteful".

The plural form of "wasteful" is "wastefuls".

The singular form of the word "wasteful" is "waste"