From the Sindhi (Devanagari) To English Dictionary:
Obstinate, stubborn, willful
S निठरु adj.
نٺر
Abbreviations
con = Conjunction, int = Interjection, plu = Plural, pre = Preposition, adj = Adjective, s = Singular, m = Masculine, f = feminine, v = verb, adv = adverb, imp = imperative, v.a = verb active, v.n = verb neuter.