i Register
In some senses, important is marked as obsolete. Watch for register when choosing this word.
adj
Having relevant and crucial value; having import.
We thought it important for there to be a fire escape at the back of every building.
Thus, when he drew up instructions in lawyer language, he expressed the important words by an initial, a medial, or a final consonant, and made scratches for all the words between. His clerks, however, understood him very well.
Pompous; self-important.
"[…] It is a match that must give universal satisfaction. In short, it is a kind of thing that"—lowering his voice to an important whisper—"will be exceedingly welcome to all parties." Recollecting himself, however, he added, "That is, I mean to say—your friends are all truly anxious to see you well settled; Fanny particularly […]"