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 निष्ठित
निष्ठितniṣṭhitap. p.Being in or on.
Being in or on.
Devoted to.
Versed or skilled in.
Firm, fixed.
Certain, ascertained.
Fulfilled, complete; अनिष्ठिताशः स चकार मार्गणे पुनः प्रियायाः परमं परिश्रमम् Rām.3.6.38.