Conforming completely to established rule
Requiring great or extreme bodily, mental, or spiritual strength
Not deviating from correctness, accuracy, or completeness
Having no errors
Conforming to fact
His imprisonment was not a rigorous one, and negotiations for his release were soon begun.
Besides all this, life was further regulated by an exceedingly rigorous system of fasts.
Thomas died in Newgate gaol, London, but Bartholomew's imprisonment was not a rigorous one.
This generally involves solitary confinement of the most rigorous nature, and, as little is done to occupy the mind, the criminal not infrequently becomes insane.
His internal administration, though not sufficiently rigorous to check abuses, was upright and thoughtful.