Something strenuous requires all your effort and strength, like a hard workout at the gym or carrying a backpack full of heavy books.

Strenuous can also describe something done with lots of energy or force. If your boss asks you to do a strenuous task like carry a couch up a flight of stairs by yourself, and you refuse by jumping up and down in protest, you have a strenuous objection to her request. To remember how to spell it, remember that something strenuous requires the strength of two of you! That's why there are two u's in strenUoUs.

Definitions of strenuous
  1. adjective
    taxing to the utmost; testing powers of endurance
    “a strenuous task”
    synonyms: arduous, straining
    requiring great physical effort
  2. adjective
    characterized by or performed with much energy or force
    strenuous exercise”
    possessing or exerting or displaying energy
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