形容词 永恒的; 无日期的; 无期限的; 不可能过时的
1. 无期限的：dated 有日期的 | dateless 无期限的 | dateline 日期变更线
2. 无日期的：无任所大使ambassador-at-large | 无日期的dateless | 无融合生殖apomixis
3. 无日期的/无限期的：dated /过时/ | dateless /无日期的/无限期的/ | dateline /日期变更线/日界线/日期栏/
adj
1. dateless
1. unaffected by time
e.g. few characters are so dateless as Hamlet
Helen's timeless beauty
Synonym: timeless
2. not bearing a date
e.g. a dateless letter
Synonym: undated
3. of such great duration as to preclude the possibility of being assigned a date
e.g. dateless customs
4. having no known beginning and presumably no end
e.g. the dateless rise and fall of the tides
time is endless
sempiternal truth
Synonym: endless sempiternal