Antonyms of adj datable

1 sense of datable

Sense 1
datable (vs. undatable), dateable -- (that can be given a date; "a concrete and datable happening"- C.W.Shumaker)

undatable (vs. datable) -- (not capable of being given a date)
        => dateless, undated -- (not bearing a date; "a dateless letter")
        => dateless -- (of such great duration as to preclude the possibility of being assigned a date; "dateless customs")

Similarity of adj datable

1 sense of datable

Sense 1
datable (vs. undatable), dateable -- (that can be given a date; "a concrete and datable happening"- C.W.Shumaker)