16
inaccessible(adjective, reach, out, expensive, high-priced)
15
unobtainable(adjective, expensive, high-priced, pricey, pricely)
14
unachievable(adjective, inaccessible, impossible)
13
impossible(adjective, wild, unreasonable, useless, absurd)
13
unrealizable(adjective, unreasonable, possible, inaccessible, impossible)
12
unworkable(adjective, unreasonable, useless, absurd, excessive)
12
impracticable(adjective, wild, unreasonable, useless, absurd)
11
unapproachable(adjective, difficult, reach, expensive, high-priced)
11
unavailable(adjective, reach, expensive, high-priced, pricey)
11
unfeasible(adjective, unreasonable, useless, absurd, impractical)
9
unreachable(adjective, reach, inaccessible, impossible, out-of-the-way)
8
impractical(adjective, unreasonable, useless, absurd, possible)
7
undoable
6
hopeless(adjective, impossible, impossibility)
6
impervious(adjective, inaccessible, impossible, impossibility)
6
inconceivable(adjective, impossible)
6
infeasible(adjective, wild, unreasonable, useless, absurd)
5
absurd(adjective, wild, unreasonable, useless, preposterous)
5
insurmountable(adjective, inaccessible, impossible, impossibility)
5
out of reach(expression, idiom, impossibility)
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APASmart Define. (2015). unattainable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/unattainable/thesaurus/synonyms
ChicagoSmart Define. 2015. "unattainable thesaurus" https://smartdefine.org/unattainable/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, unattainable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/unattainable/thesaurus/synonyms>.
MLASmart Define. "unattainable thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/unattainable/thesaurus/synonyms>