RIGOR Synonyms: 137 Similar and Opposite Words - Merriam-Webster
https://www.merriam-webster.com/thesaurus/rigor
WEBSynonyms for RIGOR: hardship, difficulty, hardness, obstacle, adversity, asperity, trial, hurdle; Antonyms of RIGOR: opportunity, advantage, break, flexibility, gentleness, tolerance, patience, tenderness.
DA: 4 PA: 70 MOZ Rank: 51