Close-lipped means to be secretive or reluctant to divulge information. Some synonyms for close-lipped are reticent, reserved, taciturn, uncommunicative, tight-lipped, silent, and guarded. These words all convey a sense of someone who is unwilling to share information or feelings. Someone who is reticent may be hesitant or unwilling to speak, while a person who is reserved is typically quiet and thoughtful. Taciturn individuals are laconic and aloof, and may speak only when necessary. Uncommunicative is a blanket term for anyone who doesn't communicate effectively, while tight-lipped may describe someone who is keeping a secret. Silent describes someone who doesn't speak at all, and guarded indicates a sense of caution or suspicion.