Lacking a drain; unable to drain or remove liquid; designed without drainage capability.
From 'drain' + '-less' (suffix meaning 'without' or 'lacking'). This is a straightforward English negation pattern used to describe the absence of a drain or drainage system.
A drainless container is surprisingly useful—think of impermeable shower pans or bathtubs that trap water deliberately. The term highlights how 'drain' can be either a feature you want (in a sink) or a problem you want to prevent (in a bath).
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