rigor

1 something that is a cause for suffering or special effort especially in the attainment of a goal hard-bitten folk who survived many rigors on the way to the promised land Synonyms adversity, asperity, hardness, hardship, difficultyRelated Words discomfort, inconvenience, nuisance; affliction, trial, tribulation; knock, misfortune, mishap, tragedy; bar, catch, check, clog, crimp, embarrassment, handicap, hindrance, hitch, hurdle, impediment, interference, let, manacle, obstacle, obstruction, pons asinorum, rub, shackle, snag, stop, trammel; block, chain, deterrent, encumbrance, fetter, inhibition; humpNear Antonyms advantage, break, opportunity

2 the quality or state of being demanding or unyielding (as in discipline or criticism) after being coddled by his former coach, the swimmer was shocked by the rigor of the new training program Synonyms exactingness, hardness, harshness, inflexibility, rigidity, rigidness, severity, rigorousness, sternness, strictness, stringencyRelated Words callousness, hard-heartedness, implacability, obduracy, obdurateness, pitilessness; dourness, gruffness; asceticism, austereness, austerity, monasticism; determination, firmness, resolve, steadfastness; obstinacy, stubbornnessNear Antonyms forbearance, indulgence, kindness, lenience, patience, softness, tenderness, tolerance; responsiveness, willingness; compliance, pliability, pliancyAntonyms flexibility, gentleness, laxness, mildness

3 the quality or state of being very accurate said that she had heard that excuse a million times, but then she was never known for the rigor of her calculations Synonyms accuracy, accurateness, closeness, delicacy, exactitude, exactness, fineness, nicety, perfection, preciseness, precision, rigorousness, ultraprecision, veracityRelated Words correctness, fidelity, rightness, strictness, truth; definiteness, definitiveness, definitude, determinacy; nicety, subtlety; care, carefulness, fastidiousness, meticulousness, persnicketinessNear Antonyms approximation, roundness; falseness, falsity, incorrectness, wrongness; carelessness, guesswork, looseness; indefiniteness, vaguenessAntonyms coarseness, impreciseness, imprecision, inaccuracy, inexactitude, inexactness, roughness