Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
The word neutrarum could not be parsed. Trying a normal dictionary lookup:
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neutrālis, e, adj. [neuter], in gram., of the gender of substantives, neuter: positio, Quint. 1, 4, 24: nomina, id. 1, 5, 54 et saep.
Hence, adv.: neutrālĭter, as a neuter; Gellius fora navium neutraliter dixit, Charis. p. 55 P.