Je ne sais pas trop, ça dépend vraiment des circonstances.

Pronunciation: zhuh nuh say pah troo, sah day-pond vray-mahn day ser-kon-stahns

Meaning: I'm not really sure, it really depends on the circumstances.

This phrase is a natural way to express hesitation and nuance in everyday French conversations, showing sophistication by acknowledging context—a hallmark of French communication style.