Not lenient (6)
I believe the answer is:
strict
(Other definitions for strict that I've seen before include "Severe and unyielding" , "Tough" , "Hard" , "Exacting, unsparing" , "Severe, stern" .)
I believe the answer is:
strict
(Other definitions for strict that I've seen before include "Severe and unyielding" , "Tough" , "Hard" , "Exacting, unsparing" , "Severe, stern" .)