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in the PONS Dictionary

rig·or·ous [ˈrɪgərəs, Am -gɚ-] ADJ

1. rigorous approv (thorough):

rigorous
rigorous
rigorous testing

2. rigorous (disciplined):

rigorous
rigorous
rigorous
CH, A a. rigoros
she is a rigorous vegetarian
rigorous discipline

3. rigorous (physically demanding):

rigorous
hart <härter, am härtesten>
rigorous training

4. rigorous (harsh):

rigorous climate/weather