1
unearthly
1
ungodly
1
unimaginable
1
unintelligible(adjective, hard, obscure, delicate, ambiguous)
1
unthinkable
1
unworthy of belief(expression, idiom)
1
uphill(adjective, difficult, complex, awkward, demanding)
1
upsetting
0
Daedalean(adjective, difficult, complex, intricate, thorny)
0
arduous(adjective, difficult, complex, awkward, demanding)
0
backbreaking(adjective, difficult, awkward, demanding, grueling)
0
baffler
0
between rock and hard place(adjective, debatable)
0
between sixes and sevens(adjective, debatable)
0
bone of contention(adjective, debatable)
0
bothersome(adjective, difficult, awkward, demanding, grueling)
0
burdensome(adjective, difficult, awkward, demanding, grueling)
0
can of worms(expression, adjective, idiom, difficult, complex)
0
changing
0
clear as dishwater(adjective, ambiguous)
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APASmart Define. (2015). problematical thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/problematical/thesaurus/synonyms
ChicagoSmart Define. 2015. "problematical thesaurus" https://smartdefine.org/problematical/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, problematical thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/problematical/thesaurus/synonyms>.
MLASmart Define. "problematical thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/problematical/thesaurus/synonyms>