Unreserved (adjective)

1. Not having been reserved or not having been set aside.
2. Not having been limited or not having been restricted.
3. Not having been reserved or not having been shy or hesitant.

Origin:

From the latin word "in-" meaning not and the past participle "reservatus" meaning reserved or kept.

Examples:

1. The unreserved tickets were sold out within minutes.
2. He had unreserved access to the CEO's office.
3. The unreserved parking spots were quickly filled.
4. She gave him an unreserved apology.
5. The unreserved praise was well-deserved.