140 entries under adjective topic. ×

1
sphinxlike(obscure, dark, strange, uncertain)
1
superphysical(obscure, dark, supernatural)
1
supersensible(obscure, dark, superior, supernatural)
1
tenebrous(obscure, difficult, strange, uncertain)
1
twisted
1
uncertain(obscure, difficult, dark, mysterious)
1
uncountable
1
uncounted
1
undefined(doubtful, vague, unclear, ambiguous)
1
unplumbable
0
broad
0
complicated(hard, obscure, sophisticated, tricky)
0
gloomy
0
great
0
wide
0
Byzantine
0
Gordian
0
amphibological(obscure, difficult, uncertain, unclear)
0
astronomical
0
chasmal
11 years ago|14k views|share |citing 
APASmart Define. (2015). unfathomable thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/unfathomable/thesaurus/synonyms
ChicagoSmart Define. 2015. "unfathomable thesaurus" https://smartdefine.org/unfathomable/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, unfathomable thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/unfathomable/thesaurus/synonyms>.
MLASmart Define. "unfathomable thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/unfathomable/thesaurus/synonyms>