Crossword Genius

Are lives of camels and mules so onerous? (10)

Ross

I believe the answer is:

burdensome

I'm a little stuck... Click here to teach me more about this clue!

'onerous?' is the definition.
(I know that onerous can be written as burdensome)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for burdensome that I've seen before include "Oppressive, wearisome" , "Onerous" .)

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