1. (a.) Not bidden; not commanded.

2. (a.) Uninvited; as, unbidden guests.

3. (a.) Being without a prayer.

arbitrary autonomous discretional discretionary elective free free will gratuitous independent nonmandatory offered optional proffered self-acting self-active self-determined self-determining spontaneous unacceptable unagreeable unasked unasked-for unbesought uncalled-for uncoerced uncompelled undesirable undesired unforced uninfluenced uninvited unpressured unprompted unrequested unrequired unsolicited unsought unwanted unwelcome unwished voluntary volunteer willful