Metaphysical (adjective)

1. Concerned with the nature of reality and existence, especially abstract and theoretical concepts.
2. Relating to or being beyond physical nature and the observable universe.

Origin:

Late 16th century: from medieval latin metaphysicus, from greek metaphusikos, from meta- "beyond" + physis "nature".

Examples:

1. Metaphysical questions such as the nature of existence and the meaning of life have been pondered for centuries.
2. The philosopher's work focused on the metaphysical nature of the mind.
3. The poet's work often dealt with metaphysical themes of love and loss.
4. Metaphysical beliefs include the existence of an eternal soul and the possibility of an afterlife.
5. The metaphysical implications of quantum mechanics have yet to be fully understood.