other ways to say "very important"
vital
absolutely necessary or important; essential. secrecy is of vital importance. synonymes: essential, of the essence, critical, crucial, key, indispensable, integral,
essential
absolutely necessary; extremely important. it is essential to keep up-to-date records synonymes: crucial, necessary, key, vital, indispensable, important, all-important, of the essence, critical, imperative, mandatory, compulsory, obligatory, urgent, pressing, paramount, preeminent, high-priority, non negotiable, must-have (of a disease) with no known external stimulus or cause; idiopathic. essential hypertension
fundamental
forming a necessary base or core; of central importance. the protection of fundamental human rights synonymes: basic, underlying, core, foundational, rudimentary, elemental, elementary, basal, root.
paramount
more important than anything else; supreme.
critical
of the greatest importance to the way things might happen: The president's support is critical (to this project). a critical decision
imperative
of vital importance; crucial. immediate action was imperative synonymes: vitally important, of vital importance, all-important, vital, crucial, critical, essential, nece
at the end of the day
used for saying what you consider is the most important thing about a situation after thinking about it