Example sentences:

Ramayana: Mandodari begged Ravana to stop being fixated on Sita: “Was getting her worth risking everything he had built throughout his life?” 

 Mahabharata: During the gambling match, Karna became so fixated on pleasing Duryodhana that he completely lost his moral compass and came up with the despicable idea to disrobe Draupadi.  

 Bhagavad-gita: As long as our mind is fixated on sensual pleasures, it can’t stay fixed on spiritual truths. (Adaptation of Gita 02.44)