Timeless and Unwaning

Timeless adjective - Having an existence or validity that does not change or diminish.

Unwaning and timeless are semantically related In some cases you can use "Unwaning" instead an adjective "Timeless".

Timeless and unwaning are semantically related in constant topic. Sometimes you can use "Timeless" instead an adjective "Unwaning", if it concerns topics such as continual.