Synonyms: constrained, forced, strained
Definition: lacking spontaneity; not natural
Usage: a constrained smile; forced heartiness; a strained smile
Similar words: affected, unnatural
Definition: speaking or behaving in an artificial way to make an impression
Synonyms: forced
Definition: made necessary by an unexpected situation or emergency
Usage: a forced landing
Similar words: unscheduled
Definition: not scheduled or not on a regular schedule
Usage: an unscheduled meeting; the plane made an unscheduled stop at Gander for refueling
Synonyms: forced
Definition: forced or compelled
Usage: promised to abolish forced labor
Similar words: unvoluntary, nonvoluntary, involuntary
Definition: not subject to the control of the will
Usage: involuntary manslaughter; involuntary servitude; an involuntary shudder; It (becoming a hero) was involuntary. They sank my boat- John F.Kennedy