Unchanging (adjective)

1. Not subject to change or alteration.
2. Remaining constant or unchanging over time.

Origin:

Late 16th century: from un- (expressing negation) + changing, present participle of change.

Examples:

1. The unchanging landscape of the desert was both beautiful and bleak.
2. Despite the passage of time, the unchanging nature of human behavior continues to surprise us.
3. The unchanging principles of the company have remained a source of stability and success.
4. The unchanging love between the two friends was an inspiration to all.
5. The unchanging policy of the government has been a source of controversy for many years.