He is known for being uncommunicative.

She sat uncommunicatively in the corner, avoiding eye contact with anyone.

Her uncommunicativeness made it difficult to have a conversation with her.

The uncommunicated information caused confusion among the team members.

There was a complete uncommunication between the two parties.

She felt uncomfortable in the uncommunal atmosphere of the party.

He is uncommunicating and rarely shares his thoughts with others.