uninvited (adj.)
- arbitrary
- autonomous
- discretional
- discretionary
- elective
- free
- gratuitous
- independent
- nonmandatory
- optional
- self-acting
- spontaneous
- unacceptable
- unasked
- unasked-for
- uncalled-for
- uncoerced
- undesirable
- undesired
- unforced
- uninfluenced
- unprompted
- unrequested
- unsolicited
- unsought
- unwanted
- unwelcome
- unwished
- voluntary
- volunteer
- willful