Reticent

Latin reticens, present participle of reticere ("to keep silence"); re- + tacere ("to be silent").

Full definition of reticent

1856, Ralph Waldo Emerson, , :They are slow and reticent, and are like a dull good horse which lets every nag pass him, but with whip and spur will run down every racer in the field.
1870, Charles Dickens, , ch XXIII:But he was a reticent as well as an eccentric man; and he made no mention of a certain evening when he warmed his hands at the gatehouse fire, and looked steadily down upon a certain heap of torn and miry clothes upon the floor.
1891, Thomas Hardy ,, ch LIV:She had told him she was not now at Marlott, but had been curiously reticent as to her actual address, and the only course was to go to Marlott and inquire for it.
1915, John Buchan, , ch 3:The milkman had been released, I read, and the true criminal, about whose identity the police were reticent, was believed to have got away from London by one of the northern lines.
1922, H. P. Lovecraft, :The inhabitants of that street impressed me peculiarly; At first I thought it was because they were all silent and reticent; but later decided it was because they were all very old.
1922, Rafael Sabatini, , ch XXV:But they were not reticent enough to prevent the circulation of certain uneasy rumours and extravagant stories of discreditable adventures.