Characterized by wasting or squandering; using more of something than necessary or throwing things away unnecessarily.
From 'waste' (to use up without purpose) combined with '-ful' (full of, characterized by). The word emerged in Middle English as a moral judgment about inefficient use of resources.
The word 'wasteful' carries a moral weight that pure English doesn't require—you could say 'uses a lot' neutrally, but 'wasteful' is inherently judgmental, showing how languages embed cultural values about sustainability and resource use.
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