Unceasing (adjective)

Never stopping or ending; continuing without interruption.

Origin:

From un- (not) + ceasing (stopping or ending).

Examples:

1. The unceasing rain made it impossible for the hike to continue.
2. His unceasing efforts eventually paid off.
3. She had an unceasing desire to learn.
4. The unceasing noise from the construction outside was maddening.
5. The company's unceasing growth is a testament to its success.