toxique

/tɔksik/
1.
adjective

toxic

poisonous

harmful (chemically or biologically)

Fais attention, ces produits sont hyper toxiques.

Be careful, these products are very toxic.

2.
adjective

toxic (used figuratively for a person, relationship, or atmosphere that causes psychological harm)

Il faut que tu t'éloignes d'elle, elle est vraiment toxique pour toi.

You need to distance yourself from her — she's really toxic for you.