rigorously

UK: /ˈrɪgərəsli/

WordReference Random House Learner's Dictionary of American English © 2026

rig•or•ous /ˈrɪgərəs/  adj. 

1. of or relating to rigor:
   rigorous exercise; rigorous research.

WordReference Random House Unabridged Dictionary of American English © 2026

rig•or•ous  (rig′ər əs), adj. 

1. characterized by rigor;
   rigidly severe or harsh, as people, rules, or discipline:
   rigorous laws.
2. severely exact or accurate;
   precise:
   rigorous research.
3. (of weather or climate) uncomfortably severe or harsh;
   extremely inclement.
4. Mathematics, Philosophy [Logic, Math.] logically valid.

• Medieval Latin rigōrōsus. See rigor, -ous
• Middle English 1350–1400

rig′or•ous•ly, adv. 
rig′or•ous•ness, n. 
Synonyms

• 1. stern, austere, hard, inflexible, stiff, unyielding. See strict. 
• 2. demanding, finical.
• 3. hard, bitter.

Antonyms

• 1. flexible, soft.
• 2. inaccurate.
• 3. mild.