Antonyms of adj unhelpful

1 sense of unhelpful

Sense 1
unhelpful (vs. helpful) -- (providing no assistance)

helpful (vs. unhelpful) -- (providing assistance or serving a useful function)
        => accommodating -- (obliging; willing to do favors; "made a special effort to be accommodating")
        => adjuvant -- (enhancing the action of a medical treatment; "the adjuvant action of certain bacteria")
        => assistive -- (giving assistance)
        => face-saving -- (maintaining dignity or prestige; "a face-saving compromise")
        => facilitative -- (freeing from difficulty or impediment; "facilitative changes in the economic structure")
        => facilitatory -- (inducing or aiding in facilitating neural activity)
        => implemental, instrumental, subservient -- (serving or acting as a means or aid; "instrumental in solving the crime")
        => laborsaving, laboursaving -- (designed to replace or conserve human and especially manual labor; "laborsaving devices like washing machines")
        => ministrant -- (giving practical help to; "a ministering angel"; "the angels ministrant sang"; "the attending physician")
        => reformative, reformatory -- (tending to reform; "reformative and rehabilitative agencies"; "reformatory punishment")
        => right-hand -- (most helpful and reliable; "my right-hand man")
        => stabilizing, stabilising -- (causing to become stable; "the family is one of the great stabilizing elements in society")
        => steadying -- (causing to become steady; "had a steadying effect on her nerves")

Similarity of adj unhelpful

1 sense of unhelpful

Sense 1
unhelpful (vs. helpful) -- (providing no assistance)
       => unaccommodating -- (offering no assistance; "rudely unaccommodating to the customers"; "icily neutral, disagreeably unhelpful")
       => unconstructive -- (not constructive)
          Also See-> discouraging#1; uncooperative#1