Antonyms of adj beneficial

1 sense of beneficial

Sense 1
beneficial, good -- (promoting or enhancing well-being; "an arms limitation agreement beneficial to all countries"; "the beneficial effects of a temperate climate"; "the experience was good for her")

INDIRECT (VIA advantageous) -> disadvantageous -- (constituting a disadvantage)

Similarity of adj beneficial

1 sense of beneficial

Sense 1
beneficial, good -- (promoting or enhancing well-being; "an arms limitation agreement beneficial to all countries"; "the beneficial effects of a temperate climate"; "the experience was good for her")
       => advantageous (vs. disadvantageous) -- (giving an advantage; "a contract advantageous to our country"; "socially advantageous to entertain often")