Meanings of became obsessive in English

Like so many young organizers, Kellman became obsessive about his work.

In the months which followed Sol became obsessive about obtaining information on Hyperion, the Time Tombs, and the Shrike.

He became obsessive compulsive for a time, showering up to eight times a day and unable to eat in his own kitchen.

Suddenly people became obsessive about checking inboxes, spending hours sending and receiving messages and worrying over the undefined rules of email etiquette.

With Scheunemann and Biegun, she became obsessive, wanting to put every pertinent piece of information, including the names of world leaders, on separate cards.