IPA: /ɪnˈtɛnslɪ/
KK: /ɪnˈtɛnsli/
In a way that shows strong feelings or a high level of activity.
She studied intensely for her final exams to ensure she would pass.
Intensely → It is formed from "intens" (from Latin "intensus", meaning stretched or strained) and the suffix "-ly" (meaning in a manner of). The word "intensely" means in a manner that is stretched or strained, indicating a high degree of something.
Think of something being 'stretched' or 'strained' to its limits — that's why intensely means doing something with a high degree or force.