1
sound
1
strained
1
strong
1
superincumbent(difficult, cruel, troublesome, domineering, tyrannical)
1
terrible(adjective, tough, rough, difficult, heavy)
1
threatening
1
unsparing(adjective, tough, rough, difficult, heavy)
1
uphill battle(expression, adjective, tough, rough, difficult)
1
vexatious
1
walrus
1
wearing(adjective, hard, tough, rough, difficult)
1
wearying(adjective, tough, rough, difficult, heavy)
0
annoying
0
agonistic
0
almighty
0
bad
0
calcified
0
ceramic
0
challenging(adjective, difficult, awkward, demanding, strenuous)
0
deep
11 years ago|2.5k views|share |citing 
APASmart Define. (2015). backbreaking thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/backbreaking/thesaurus/synonyms
ChicagoSmart Define. 2015. "backbreaking thesaurus" https://smartdefine.org/backbreaking/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, backbreaking thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/backbreaking/thesaurus/synonyms>.
MLASmart Define. "backbreaking thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/backbreaking/thesaurus/synonyms>