toxic
US /ˈtɑːk.sɪk/
UK /ˈtɑːk.sɪk/

1.
2.
toxique, nocif
very harmful or unpleasant in a subtle or insidious way
:
•
Their relationship became increasingly toxic.
Leur relation est devenue de plus en plus toxique.
•
He was known for his toxic masculinity.
Il était connu pour sa masculinité toxique.