Not voiced or expressed
Conveyed indirectly without words or speech
He gave his tacit approval in letters to the media.
Dean was beginning to have serious reservations about the trip and his tacit agreement to it now that it was a reality.
He kept his tacit knowledge at a distance from the investigators.
It was a tacit assumption; however, that is all the information that is already known.
For many years there was almost tacit agreement that what people needed where computers were involved was just more training.