V. S. Apte, The Practical Sanskrit–English Dictionary. Look up any word of the Gita in Devanagari, IAST or Harvard-Kyoto, or browse the headwords letter by letter.
Entry निःस्वन
निःस्वनniḥsvanaa.Soundless.
Soundless.
Derived forms and compounds
-नः Sound; सुखश्रवा मङ्गलतूर्यं- निःस्वनाः R.3.19. Also निःस्वनितम्.