- characterized by rigor; rigidly severe or harsh, as people, rules, or discipline: rigorous laws.
- severely exact or accurate; precise: rigorous research.
- (of weather or climate) uncomfortably severe or harsh; extremely inclement.
- logically valid.
- characterized by or proceeding from rigour; harsh, strict, or severe
- severely accurate; scrupulous
- (esp of weather) extreme or harsh
- (of a proof) making the validity of the successive steps completely explicit
