obsess
Definitions
To preoccupy or fill the mind of someone continually, intrusively, or to a troubling extent.
To think about something or someone constantly or excessively.
Examples
He tends to obsess over the smallest details of his work.
It is not healthy to obsess over things that are completely out of your control.
Synonyms
Antonyms
ignore disregard neglect overlook forget dismiss indifferent