Synonyms of the word

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.

endless

• adj. Having no end.
• adj. Extending indefinitely.
• adj. (obsolete) Without profitable end; fruitless; unsatisfying.

infinite

• adj. Indefinably large, countlessly great; immense.
• adj. Boundless, endless, without end or limits; innumerable.
• adj. With plural noun: infinitely many.
• adj. (mathematics) Greater than any positive quantity or magnitude; limitless.
• adj. (set theory, of a set) Having infinitely many elements.
• adj. (grammar) Not limited by person or number.
• adj. (music) Capable of endless repetition; said of certain forms of the canon, also called perpetual fugues,…
• num. Infinitely many.

sempiternal

• adj. Everlasting, eternal.
• adj. (philosophy) Everlasting – that is, having infinite temporal duration – as opposed to eternal, outside…

timeless

• adj. Eternal.
• adj. Not affected by time; ageless.
• adj. (obsolete) Done at an improper time; unseasonable; untimely.
• adj. Not decreasing over time in quality and appeal.

unaltered

• adj. Remaining in its initial state.

unchanged

• adj. Not changed or altered; remaining in an original state.
• v. simple past tense and past participle of unchange.

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.

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.