- (Britain, dialect, slang) thick-headed
"They're so dateless that Burger King will not offer them a job."
- Timeless; immortal
- Out of one's head; deranged.
- Having no date—a meeting with a lover or potential lover.
"It is hard to believe that she could be dateless on a Saturday night."
- (archaic) Without an end; endless
- Without a date imprinted, assigned, or associated.
- Without a start; immemorial