disposed to be silent or not to speak freely; reserved.
2.
reluctant or restrained.
Origin: 1825–35; < L reticent- (s. of reticēns), prp. of reticēre to be silent, equiv. to re-re-+ -tic-, comb. form of tacēre to be silent (cf. tacit) + -ent--ent
1603, from Fr. réticence, from L. reticentia "silence," from reticere "keep silent," from re-, intensive prefix, + tacere "be silent" (see tact). "Not in common use until after 1830" [OED]. Adjective form reticent is from 1834.