Antonyms of adj unforced

2 senses of unforced

Sense 1
uncoerced, unforced, willing -- (not brought about by coercion or force; "the confession was uncoerced")

INDIRECT (VIA voluntary) -> involuntary, 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)

Sense 2
unforced, unstrained -- (not resulting from undue effort; not forced; "a voice with a pleasingly unforced quality"; "his playing is facile and unstrained")

INDIRECT (VIA effortless) -> effortful -- (requiring great physical effort)

Similarity of adj unforced

2 senses of unforced

Sense 1
uncoerced, unforced, willing -- (not brought about by coercion or force; "the confession was uncoerced")
       => voluntary (vs. involuntary) -- (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")

Sense 2
unforced, unstrained -- (not resulting from undue effort; not forced; "a voice with a pleasingly unforced quality"; "his playing is facile and unstrained")
       => effortless (vs. effortful) -- (requiring or apparently requiring no effort; "the swallows glided in an effortless way through the busy air")