This is the 3268th most frequent French word.
strictement
Strictly.
In this sentence, 'strictement' (strictly) is used to emphasize the prohibition, showing that no exceptions are allowed.
L'accès à cette zone est strictement interdit.
Access to this area is strictly forbidden.
Here, 'strictement' indicates adherence to dietary rules without compromise.
Je suis strictement végétarien depuis dix ans.
I have been strictly vegetarian for ten years.
This usage of 'strictement' shows the importance of following the rule exactly and without leniency.