uninvited
UK: ˌʌnɪnˈvaɪtɪd | US: ˌʌnɪnˈvaɪtɪd
adj. not invited or asked to attend or participate
adj. unwelcome or intrusive
The word "uninvited" combines the negative prefix "un-" (from Old English "un-," meaning "not") with the verb "invite" (from Latin "invitare," meaning "to ask or summon") and the past participle suffix "-ed." The prefix "un-" negates the action of inviting, creating a term that describes someone who was not asked to attend or participate. Over time, it also gained connotations of being unwelcome or intrusive.
She felt awkward showing up uninvited to the party.
The uninvited guest caused a stir at the formal dinner.
His uninvited advice was not appreciated.
The software blocks uninvited pop-up ads.
They were surprised by the uninvited visit from their neighbors.