Synonyms|101Antonyms|0|Broader|1Narrower|0Related|2

3 entries under rigorous topic. ×

4
difficult(adjective, hard, tough, rough, problematic)
2
exacting(tough, severe, rough, difficult, painful)
2
rugged(adjective, difficult)
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APASmart Define. (2015). no picnic thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/no_picnic/thesaurus/synonyms
ChicagoSmart Define. 2015. "no picnic thesaurus" https://smartdefine.org/no_picnic/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, no picnic thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/no_picnic/thesaurus/synonyms>.
MLASmart Define. "no picnic thesaurus" 13 April 2015. Web. 27 September 2026. <https://smartdefine.org/no_picnic/thesaurus/synonyms>