Antonyms of adj volitional

1 sense of volitional

Sense 1
volitional -- (with deliberate intention; "a volitional act")

INDIRECT (VIA willing) -> unwilling -- (not disposed or inclined toward; "an unwilling assistant"; "unwilling to face facts")

Similarity of adj volitional

1 sense of volitional

Sense 1
volitional -- (with deliberate intention; "a volitional act")
       => willing (vs. unwilling) -- (disposed or inclined toward; "a willing participant"; "willing helpers")