Antonyms of adj 4th

1 sense of 4th

Sense 1
fourth, 4th, quaternary -- (coming next after the third and just before the fifth in position or time or degree or magnitude; "the quaternary period of geologic time extends from the end of the tertiary period to the present")

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

Similarity of adj 4th

1 sense of 4th

Sense 1
fourth, 4th, quaternary -- (coming next after the third and just before the fifth in position or time or degree or magnitude; "the quaternary period of geologic time extends from the end of the tertiary period to the present")
       => ordinal (vs. cardinal) -- (being or denoting a numerical order in a series; "ordinal numbers"; "held an ordinal rank of seventh")