Question

Anything tacit, then, is unspoken, unsaid, not verbalized. We speak of a tacit agreement, arrangement, acceptance, rejection, assent, refusal, etc. A person is never called tacit::Can a person be called so?.
The noun is tacitness.

Accepted Answer

Bear in mind that you can transform any adjective into a noun by adding -ness, though in many cases there may be a more sophisticated, or more common, noun form. Word Power Made Easy SESSION 25

知识	Anything tacit, then, is unspoken, unsaid, not verbalized. We speak of a tacit agreement, arrangement, acceptance, rejection, assent, refusal, etc. A person is never called tacit::Can a person be called so?. The noun is tacitness.
拓展	Bear in mind that you can transform any adjective into a noun by adding -ness, though in many cases there may be a more sophisticated, or more common, noun form.
《》	better left unsaid
出处	Word Power Made Easy SESSION 25

Noun Person Called Tacit Unspoken Unsaid Verbalized Speak