This is the 1622nd most frequent German word.
unbedingt
"Unbedingt" means "absolutely" or "necessarily."
'Unbedingt' is used here as an adverb to emphasize the necessity of waking up early.
Du solltest unbedingt früh aufstehen, um den Sonnenaufgang zu sehen.
You should absolutely wake up early to see the sunrise.
'Unbedingt' here intensifies the determination described by 'insisted'.
Er hat unbedingt auf seinen Standpunkt bestanden.
He absolutely insisted on his point of view.
'Unbedingt' emphasizes the speaker's strong wish or desire to read the book.