नैष्ठिक [naiṣṭhika] a. a. (-की f.)
Final, last, concluding; विदधे विधिमस्य नैष्ठिकम्
[R.8.25.] Decided, definitive, conclusive (as a reply.); एषा नो नैष्ठिकी बुद्धिः
[Mb.1.37.29.] Fixed, firm, constant; शान्तिमाप्नोति नैष्ठिकीम्
[Bg.5.12;] भक्तिर्भवति नैष्ठिकी
[Bhāg.1.2.18.] Highest, perfect; मोदेन वां कामसुखैर्मदाद् वा यो नैष्ठिकं श्रोष्यति नास्य धर्मम्
[Bu. Ch.1.82.] Completely familiar with or versed in.
Vowing perpetual abstinence and chastity.
Obligatory; न चैतन्नैष्ठिकं कर्म त्रयाणां भूरिदक्षिण
[Mb.12.63.23.] -कः [निष्ठा मरणं तत्पर्यन्तं ब्रह्मचर्येण तिष्ठति तिष्ठति निष्ठा-ठक्] A perpetual religious student who continues with his spiritual precept or even after the prescribed period, and vows life-long abstinence and chastity; निवेदितो नैष्ठिकसुन्दरस्तया
[Ku.5.62;] cf. नैष्ठिको ब्रह्मचारी तु वसेदाचार्यसंनिधौ
[Y.1.49] and उपकुर्वाण also.