Antonyms of adj 6th

1 sense of 6th

Sense 1
sixth, 6th -- (coming next after the fifth and just before the seventh in position)

INDIRECT (VIA ordinal) -> cardinal -- (being or denoting a numerical quantity but not order; "cardinal numbers")

Similarity of adj 6th

1 sense of 6th

Sense 1
sixth, 6th -- (coming next after the fifth and just before the seventh in position)
       => ordinal (vs. cardinal) -- (being or denoting a numerical order in a series; "ordinal numbers"; "held an ordinal rank of seventh")