仕事 しごと むし
shigotono mushi

Noun

1. workaholic; person who is totally devoted to his work

かれのことを仕事 しごと むしだと うけれど、仕事 しごとをしているときが一番 いちばん たのしいという人間 にんげんもいるんだよ。
kareno kotō shigotono mushidato iukeredo shigotō shite iru tokiga ichiban tanoshiito iu ningemmo iru ndayo.
You say he is a workaholic, but you know there are some people who feel happiest when they're working.