Habitually silent or talking little

A. Servile

B. Unequivocal

C. Taciturn

D. Synoptic

Answer: Option C

Solution(By Examveda Team)

One word substitution is Taciturn.

Servile: having or showing an excessive willingness to serve or please others.
Unequivocal: leaving no doubt.
Taciturn: (of a person) reserved or uncommunicative in speech; saying little.
Synoptic: taking or involving a comprehensive mental view.