Not healthy, as a relationship

TOXIC

["Think of a word that describes something poisonous or harmful, often used to label behaviors that drain or damage emotional well-being."]

The clue "Not healthy, as a relationship" directly hints at something harmful or damaging. In everyday language, "toxic" is the go-to word for describing relationships (or environments) that are emotionally draining, abusive, or unhealthy. There’s no hidden wordplay here—it’s a straightforward definition where the answer matches the clue’s meaning exactly. Think of how people often say "toxic friendship" or "toxic workplace" to call out bad dynamics.