Antonyms of adj unwilling

2 senses of unwilling

Sense 1
unwilling (vs. willing) -- (not disposed or inclined toward; "an unwilling assistant"; "unwilling to face facts")

willing (vs. unwilling) -- (disposed or inclined toward; "a willing participant"; "willing helpers")
        => consenting -- (having given consent; "consenting adults")
        => disposed (predicate), fain, inclined (predicate), prepared -- (having made preparations; "prepared to take risks")
        => glad, happy -- (eagerly disposed to act or to be of service; "glad to help")
        => ready -- (mentally disposed; "he was ready to believe her")
        => volitional -- (with deliberate intention; "a volitional act")
        => willing and able -- (not reluctant)

Sense 2
unwilling -- (in spite of contrary volition)

INDIRECT (VIA involuntary) -> voluntary -- (of your own free will or design; done by choice; not forced or compelled; "man is a voluntary agent"; "participation was voluntary"; "voluntary manslaughter"; "voluntary generosity in times of disaster"; "voluntary social workers"; "a voluntary confession")

Similarity of adj unwilling

2 senses of unwilling

Sense 1
unwilling (vs. willing) -- (not disposed or inclined toward; "an unwilling assistant"; "unwilling to face facts")
       => grudging -- (of especially an attitude; "gave grudging consent"; "grudging acceptance of his opponent's victory")
       => loath, loth, reluctant -- (unwillingness to do something contrary to your custom; "a reluctant smile"; "loath to admit a mistake")
       => unintentional, unwilled -- (without deliberate intent; "my heart with unwilled love grew warm"- George Macdonald)
          Also See-> defiant#1, noncompliant#1; disinclined#1; involuntary#1, nonvoluntary#1, unvoluntary#1

Sense 2
unwilling -- (in spite of contrary volition)
       => involuntary (vs. voluntary), nonvoluntary, unvoluntary -- (not subject to the control of the will; "involuntary manslaughter"; "involuntary servitude"; "an involuntary shudder"; "It (becoming a hero) was involuntary. They sank my boat"- John F.Kennedy)