4 entries under pessimistic topic. ×

8
impossible(adjective, impractical, desperate, unpromising)
7
impracticable(adjective, unreasonable, useless, absurd)
5
hopeless(adjective, unreasonable, useless, absurd)
2
irreparable(adjective, unreasonable, useless, absurd, hopeless)
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APASmart Define. (2015). unachievable thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/unachievable/thesaurus/synonyms
ChicagoSmart Define. 2015. "unachievable thesaurus" https://smartdefine.org/unachievable/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, unachievable thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/unachievable/thesaurus/synonyms>.
MLASmart Define. "unachievable thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/unachievable/thesaurus/synonyms>