Antonyms of adj 30th

1 sense of 30th

Sense 1
thirtieth, 30th -- (coming next after the twenty-ninth in position)

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

Similarity of adj 30th

1 sense of 30th

Sense 1
thirtieth, 30th -- (coming next after the twenty-ninth in position)
       => ordinal (vs. cardinal) -- (being or denoting a numerical order in a series; "ordinal numbers"; "held an ordinal rank of seventh")