Synonyms of the word

undated

• adj. Not marked with a date.
• adj. Of a style that will not go out of fashion; a classic.
• adj. (botany) Rising and falling in waves toward the margin, as a leaf; waved.

dateless

• adj. Out of one's head; deranged.
• adj. (Britain, dialect, slang) thick-headed.
• adj. Without a date imprinted, assigned, or associated.
• adj. Having no date—a meeting with a lover or potential lover.
• adj. Timeless; immortal.
• adj. Without a start; immemorial.
• adj. (archaic) Without an end; endless.

undatable

• adj. Not able to be dated; that may be not be ascribed a date (or age).
• adj. Not dateable; unsuitable for romantic outings; unattractive.
• n. A person who is unsuitable to be dated, or taken on a romantic outing.