draining

(verb) flow off gradually. Synonyms: drain, run out. Example: "The rain water drains into this big vat."

(verb) deplete of resources. Synonyms: drain. Example: "The exercise class drains me of energy."

(verb) empty of liquid; drain the liquid from. Synonyms: drain. Example: "We drained the oil tank."

(verb) make weak. Synonyms: enfeeble, debilitate, drain. Example: "Life in the camp drained him."

(adj) having a debilitating effect. Synonyms: exhausting. Example: "An exhausting job in the hot sun."