Antonyms of adj timeless

1 sense of timeless

Sense 1
dateless, timeless -- (unaffected by time; "few characters are so dateless as Hamlet"; "Helen's timeless beauty")

INDIRECT (VIA unaltered) -> altered -- (changed in form or character without becoming something else; "the altered policy promised success"; "following an altered course we soon found ourselves back in civilization"; "he looked...with clouded eyes and with an altered manner of breathing"- Charles Dickens)

Similarity of adj timeless

1 sense of timeless

Sense 1
dateless, timeless -- (unaffected by time; "few characters are so dateless as Hamlet"; "Helen's timeless beauty")
       => unaltered (vs. altered), unchanged -- (remaining in an original state; "persisting unaltered through time")