1. rigorous That is severe which is devoid of all softness, mildness, tenderness, indulgence or levity, or (in literature and art) devoid of unnecessary ornament, amplification, or embellishment of any kind; a Synonyms: severe, austere, inflexible, rigorous, uncompromising, hard, morose, stern, unmitigated, harsh, relentless, stiff, unrelenting, inexorable, rigid, strict, unyielding Antonyms: affable, easy, gentle, lenient, pliable, sweet, tractable, bland, genial, indulgent, mild, soft, tender, yielding
Synonyms for rigorous 
