Synonyms of unrequested

2 Syllables
willing, unsought
3 Syllables
unasked, spontaneous, impudent, unbidden, presumptuous, arrogant, unprompted, unwanted, gratuitous
4 Syllables
unwelcome, uncalled-for, overbearing, undemanded, uninvited, undesired
5 Syllables
voluntarily, unsolicited
7 Syllables
supererogatory