noun
workaholic; fiend for work; career-minded person
Describes someone whose life revolves around work, often to the exclusion of personal life. Can be neutral or slightly negative depending on context.
彼は典型的な仕事人間で、休日もほとんど会社にいる。
He is a typical workaholic; he's at the office even on most holidays.
仕事人間だった父が、定年後に趣味を見つけて変わった。
My father, who was a workaholic, changed after retirement when he found a hobby.