undated

adj. not having a date written or printed on it.

adj. lacking a date or chronological marker. This sense is non-gradable.

“The police found an undated letter in the drawer that mentioned the secret meeting.”

“The archive contains several undated manuscripts, making it difficult for historians to establish a precise timeline of the author's early development.”

adj. not looking old-fashioned; a style that stays popular for a long time.

adj. not showing signs of belonging to a particular past period; possessing a timeless quality that avoids becoming obsolete.

“Her style is undated because she prefers simple, classic clothes over fast fashion.”

“The architect's work remains undated, retaining a modern aesthetic appeal decades after the initial construction was completed.”

Formal

adj. having a wavy edge that rises and falls, usually describing a leaf.

adj. having a wavy or fluctuating margin. Used specifically to describe the physical structure of leaves or similar biological membranes.

“The botanist identified the plant by its unique, undated leaves.”

“The specimen is characterized by its undated leaf margins, which distinguish it from other closely related species in the same genus.”

Technical