निष्ठावान मतलब [वि.] - जो किसी के प्रति निष्ठा रखता हो; निष्ठा रखने वाला। Also see Nishthavan in English.
Here is meaning of Nishthavan in hindi. Get definition and hindi meaning of Nishthavan. What is Hindi definition and meaning of Nishthavan ? (hindi matlab - arth kya hai?).