Manifesting, exercising, or favoring rigor; allowing no abatement or mitigation; scrupulously accurate; exact; strict; severe; relentless; as, a rigorous officer of justice; a rigorous execution of law; a rigorous definition or demonstration.
Severe; intense; inclement; as, a rigorous winter.
You got to be rigorous in your appraisal system. The biggest cowards are managers who don't let people know where they stand. Jack Welch
Conservatism has had from its inception vigorously positive, intellectually rigorous agenda and thinking. That agenda should have in my three pillars: strengthen the economy, strengthen our security, and strengthen our families. Mitt Romney
To take photographs means to recognize - simultaneously and within a fraction of a second - both the fact itself and the rigorous organization of visually perceived forms that give it meaning. It is putting one's head, one's eye and one's heart on the same axis. Henri Cartier-Bresson
Thus, in a sense, mathematics has been most advanced by those who distinguished themselves by intuition rather than by rigorous proofs. Felix Klein
All, all is theft, all is unceasing and rigorous competition in nature; the desire to make off with the substance of others is the foremost - the most legitimate - passion nature has bred into us and, without doubt, the most agreeable one. Marquis de Sade
rigorous in Dutch is streng, wettisch, gestreng, strikt
rigorous in Finnish is ankara
rigorous in French is rigoureux
rigorous in German is hart, hart, streng
rigorous in Italian is severo
rigorous in Spanish is riguroso