intensively
UK: ɪnˈtɛnsɪvli | US: ɪnˈtɛnsɪvli
adv. in a manner involving concentrated effort or energy
adv. to a thorough or exhaustive degree
The root "intens" derives from Latin intendere ("to stretch, strain"), combining in- ("toward") + tendere ("to stretch"). The suffix -ive forms adjectives indicating tendency or capacity, while -ly converts adjectives into adverbs. The word evolved from describing physical stretching to metaphorical "stretching" of effort or focus, hence "intensively" meaning "with great concentration."
She studied intensively for the final exam.
The team worked intensively to meet the deadline.
The area was searched intensively for clues.
He trained intensively before the marathon.
The doctor monitored the patient intensively overnight.