Antonyms of adj hebdomadal

1 sense of hebdomadal

Sense 1
weekly, hebdomadal, hebdomadary -- (of or occurring every seven days; "a weekly visit"; "weekly paper")

INDIRECT (VIA periodic) -> aperiodic, nonperiodic -- (not recurring at regular intervals)

Similarity of adj hebdomadal

1 sense of hebdomadal

Sense 1
weekly, hebdomadal, hebdomadary -- (of or occurring every seven days; "a weekly visit"; "weekly paper")
       => periodic (vs. aperiodic), periodical -- (happening or recurring at regular intervals; "the periodic appearance of the seventeen-year locust")