/ˈrɪɡərəs/
rig·or·ous
BrE /ˈrɪɡərəs/
NAmE /ˈrɪɡərəs/
done carefully and with a lot of attention to detail
SYN thorough
a rigorous analysis
demanding that particular rules, processes, etc. are strictly followed
SYN strict
The work failed to meet their rigorous standards.
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rig·or·ous·ly
BrE /ˈrɪɡərəsli/
NAmE /ˈrɪɡərəsli/
The country’s press is rigorously controlled.