Un-forthcoming means refusing to provide information, uncooperative, or not forthcoming. The antonyms for un-forthcoming are forthcoming, cooperative, communicative, open, and transparent. Forthcoming means willing to share information or to talk freely, cooperative implies working together or consenting to a request, communicative implies actively listening and exchanging information, open means being honest and welcoming, and transparent implies being clear, visible, and frank. These antonyms convey a sense of willingness to engage and participate in a productive and positive way. When someone is forthcoming, cooperative, and transparent, it signals trust, respect, and mutual understanding in any interaction or communication.