Unvarying (adjective)

1. Not changing or different in any way.
2. Consistent and unchanging over a period of time.

Origin:

Derived from the word 'vary' meaning to change or be different.

Examples:

1. The weather in the desert is unvarying, hot and dry.
2. Her mood was unvarying, always happy and positive.
3. The company's profits have been unvarying for the past decade.
4. His daily routine was unvarying, always the same.
5. The melody was unvarying, always the same notes in the same order.