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Adjective: backbreaking  'bak,brey-king
  1. Characterized by effort to the point of exhaustion; especially physical effort
    "worked their backbreaking way up the mining valley";
    - arduous, grueling [US], gruelling [Brit, Cdn], hard, heavy, laborious, operose, punishing, toilsome, killing [informal]

See also: effortful

Nearest

backbench
backbencher
backbend
backbite
backbiter
backblast
back-blast
backblocks
backboard
backbone
backbreaking
back-channel
backchat
backcloth
backcomb
back-comb
backcross
backdate
backdoor
backdown
backdraft