"draining" in the verb sense
1. drain, run out
flow off gradually
"The rain water drains into this big vat"
deplete of resources
"The exercise class drains me of energy"
empty of liquid drain the liquid from
"We drained the oil tank"
4. enfeeble, debilitate, drain
"Life in the camp drained him"
"draining" in the adjective sense
1. draining, exhausting
having a debilitating effect
"an exhausting job in the hot sun"
Source: WordNet® (An amazing lexical database of English)
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