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 निर्दर
निर्दरnirdaraa.Hard.
Hard.
Pitiless.
Shameless. रः, (रिः) A cave, cavern; सन्तीह गिरिदुर्गाणि निर्दराः कन्दराणि च Rām.3.67.5;4.13.6.
waterfall, spring.
Derived forms and compounds
-रम् Essence (सार).
-वासिन्Adjective inhabiting a cave; गिरिनिर्दरवासिनाम् Rām.