A person who comes to see another person or a place.

A guest or an attendee at an event.

अतिथि

English Usage: We had an unexpected visitor at the party last night.

Hindi Usage: कल रात पार्टी में हमें एक अप्रत्याशित अतिथि मिला।

Not expected; surprising.

Something occurring without warning.

अचानक

English Usage: The unexpected turn of events changed the course of the day.

Hindi Usage: घटनाओं का अप्रत्याशित मोड़ दिन के क्रम को बदल दिया।

To go and see someone in a particular place.

To attend or participate in an event.

उपस्थित होना

English Usage: They plan to visit the unexpected exhibition downtown.

Hindi Usage: वे अप्रत्याशित प्रदर्शनी में उपस्थित होने की योजना बना रहे हैं।