toxic >> ˈtɒksɪk
Definition: [adjective] poisonous.
Example: the dumping of toxic waste
Definition: [adjective] very harmful or unpleasant in a pervasive or insidious way.
Example: a toxic relationship
Definition: [adjective] denoting or relating to debt that has a high risk of default.
Example: toxic debts
Definition: [noun] poisonous substances.