How to Say "i waste" in Spanish
The most common Spanish word for “i waste” is “desperdicio” — use this word when you are talking about the act of using a resource like water, food, or money inefficiently or to excess..
desperdicio
/des-pair-DEE-syoh//despeɾˈdisjo/

Examples
Yo nunca desperdicio el agua.
I never waste water.
Si no estudio, desperdicio mi oportunidad.
If I don't study, I waste my opportunity.
The 'O' Ending
When you see 'desperdicio' ending in 'o', it means 'I waste'. If it were just the noun 'waste', it would usually follow a word like 'el' or 'un'.
pierdo
/pyehr-doh//ˈpjeɾðo/

Examples
Si no hay un plan, pierdo demasiado tiempo pensando.
If there is no plan, I waste too much time thinking.
No pierdo dinero en cosas que no necesito.
I don't waste money on things I don't need.
Desperdicio vs. Pierdo
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