"seinerseits" in English seinerseits {adv.} on his part Detailed translations for "seinerseits" seinerseits{adverb} seinerseits on his part seinerseits hätte mich überrascht. Source: opensubtitles.org Corpus by OPUS Request review Sir, Mr Merdle never was quite the gentleman, and no ungentlemanly act on his part could surprise