Baretti: A dictionary of the English and Italian languages
Tácito, adv. silently, quietly, softly. Guardar una cosa —, to look silently at a thing without speaking.
Florio: a worlde of wordes, or most copious, dictionarie in Italian and English
tacito: silent, still, mum, whoosh, quiet, without noise, that speaketh not, dumb, speachlesse. Also passiuely, not spoken of, kept secret, not vttred in words, let passe without mention. Luna tácita, the new Moone, or the coniunction of the Moone with the Sun, she being not seene.