Synonym: hard, harsh, relentless, rigid, severe, strict. Similar words: vigorous, vigorously, odorous, amorous, humorous, timorous, glamorous, clamorous. Meaning: ['rɪgərəs] 
adj. 1. rigidly accurate; allowing no deviation from a standard 2. demanding strict attention to rules and procedures.
adj. 1. rigidly accurate; allowing no deviation from a standard 2. demanding strict attention to rules and procedures. 
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211. The way to avoid this problem is a rigorous cost-benefit analysis of each government project.
212. Analysis is the rigorous investigation of limiting processes in mathematics.
213. And reassurances that the due diligence performed on Merrill's books had been rigorous, despite the rush, look risible.
214. This is the rigorous statement of the principle of the equipartition of energy.
More similar words: vigorous, vigorously, odorous, amorous, humorous, timorous, glamorous, clamorous, herbivorous, malodorous, omnivorous, carnivorous, borough, factor out, thorough, thoroughly, gorgeous, rouse, arouse, onerous, righteousness, rousing, fibrous, generous, numerous, wondrous, rousseau, rapturous, dexterous, ponderous.