most exhausting

exhausting

[ig-zaw-sting]
adjective
producing or tending to produce fatigue, weariness, or the like: an exhausting day; an exhausting child.

Origin:
1530–40; exhaust + -ing2

exhaustingly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Etymonline
Word Origin & History

exhaust
1530s, "to draw off or out, to use up completely," from L. exhaustus, pp. of exhaurire "draw off, take away, use up," from ex- "off" + haurire "to draw up" (as water), from PIE *aus- "to draw water." Noun sense of "waste gas" (1848) was originally from steam engines. Related: Exhausting
Online Etymology Dictionary, © 2010 Douglas Harper
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