hard drug
US /ˌhɑːrd ˈdrʌɡ/
UK /ˌhɑːrd ˈdrʌɡ/

1.
drogue dure
an illegal drug that is addictive and seriously harmful, such as heroin or cocaine
:
•
The police seized a large quantity of hard drugs during the raid.
La police a saisi une grande quantité de drogues dures lors de la descente.
•
He was arrested for dealing hard drugs.
Il a été arrêté pour trafic de drogues dures.