Timeless
Part of speech: adjective
Definition: eternal not affected by time; ageless
Example sentence: Trends come and go, and style evolves. It's important to have pieces of jewelry that are timeless and look chic despite ever-changing fashions.
Dateless
Part of speech: adjective
Definition: Out of one's head; deranged.thick-headedWithout a date imprinted, assigned, or associated.Having no date—a meeting with a lover or potential lover.Timeless; immortalWithout a start; immemorialWithout an end; endless