As a deity name
Name 956 of the Durga Sahasranāma — Kula Arnava Tantra / Skanda Purana, as taught by Lord Shiva to Goddess Parvati
As a Hindi name
Nearest attested word 'निर्विकारा' does not appear as a word in our Hindi sources. The nearest word is निर्विकार, meaning (f. -ā), Unchanged, unaltered. — Platts (1884), digital edition courtesy DSAL, University of Chicago nearest word: निर्विकार — a suggestion, not a meaning
As a Sanskrit word
Meaning
unchanged, unchangeable, uniform, normal, (also -vat) — feminine form of nirvikāra
Scripturally attestedWhy this matches what you typed
M1 · same meaning "nirvikārā" is the feminine form of "nirvikāra" — the same word with the feminine ending (nominative).
Dictionary citations
nir—vikāra mfn. unchanged, unchangeable, uniform, normal, MBh. (also -vat), Kāv.; Suśr.
nirvikāra mfn. (-raḥ-rā-raṃ) Unchanged, unaltered, uniform. E. nir neg. vikāra change of form or state.
Caveats
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