Doing something obsessively or intensely; focusing single-mindedly on one thing.
試験前は彼がりがり勉強していたので、ほとんど休みがなかった。
Before the exam he was studying obsessively, so he hardly had any rest.
週末はレポートを書くだけでがりがり過ぎて、友達と会う時間がなかった。
I spent the weekend working intensively on the report and had no time to meet friends.
彼女は新しいゲームにがりがりはまって、食事の時間も忘れていた。
She got intensely absorbed in the new game and even forgot to eat.
Selfish or self-serving; behaving in a grasping, self-centered way.
彼は給料が上がるとすぐにがりがり行動するので、みんなから嫌われている。
As soon as his pay goes up he acts selfishly, so everyone dislikes him.
あの店長は利益優先でがりがりした態度をとることが多い。
That manager often takes a profit-first, self-serving attitude.
がりがりした性格の人とは長くは一緒に働けない。
You can't work long with someone who has a selfish character.