reticent
Cross references: 1. silent ret.i.cent \-s*nt\ aj [L reticent-, reticens, prp. of retice-re to keep silent,]fr. re- + tace-re to be silent - more at TACIT 1: inclined to be silent or secretive : UNCOMMUNICATIVE 2: restrained in expression, presentation, or appearance - ret.i.cent.ly av