'A timeless theme' is a theme for a story, play, and so on, which will never go out of date but will always be relevant to the human condition.
For example: how someone comes to terms with the death of their spouse; how a family deals with one of their number having committed a crime; how a young couple overcome the obstacles to their love.
An example of a theme that is not timeless might be the difficulties encountered by a young woman wanting to train as a doctor a hundred years ago. There might be resonances for our modern age, but the theme as such is now dated. Women are as free as men to train as doctors.
A Timeless Love
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Timeless appeal means that generations love the book. A book like The Hobbit has been popular for well over fifty years.
A Timeless Love
It explores the timeless theme of wanting to be part of the in crowd.
It is commonly referred to as a universal theme or a timeless theme. These themes are themes that resonate with readers on a personal level and can be applied to their own lives and experiences.
She wore a vintage dress that had a timeless elegance about it.
The classic design of a little black dress makes it a timeless wardrobe staple that never goes out of style.
Timeless - Doctor Who - was created in 2003.
Timeless Festival was created in 2002.
Timeless Festival ended in 2005.
Timeless Miracle was created in 1995.
Timeless Season ended in 2010.
Timeless Gift was created in 2004.
Timeless Romance was created in 1998.