This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The state or characteristic of being secretive.

n. The quality of being secretive; disposition or tendency to conceal.

n. The faculty or propensity which impels to reserve, secrecy, or concealment.

n. The character of being secretive; tendency or disposition to conceal; specifically, in phrenology, that quality the organ of which, when largely developed, is said to impel the individual toward secrecy or concealment. It is located at the inferior edge of the parietal bones. See cut under phrenology.

n. the trait of keeping things secret

n. characterized by a lack of openness (especially about one's actions or purposes)

"But secretiveness is really all this project has going for it (unlike yours truly, who, besides rock hard abs and the brainyism of an astrophysician, is cuddly like a kitty cat – call me ladies/androgynous young boys)."

evasiveness    shamefacedness    hesitancy    penuriousness    tameness    taciturnity    somnambulism    peculation    bashfulness    literalness