adjective Date: 15th century manifesting, exercising, or favoring rigor ; very strict, 2. marked by extremes of temperature or climate, harsh , severe , scrupulously accurate ; precise , see: rigid ~ly adverb ~ness noun
RIGOROUS
Meaning of RIGOROUS in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012