Collocations for important - adj.

be, seem, sound
Someone left a message for you—it sounded important.

become
remain
feel
He made me feel important by asking me lots of questions about myself.

make sth
This is what makes our work so important.

believe sth, consider sth, deem sth, regard sth as, see sth as, think sth
These ideas are considered enormously important.

extremely, fairly, very, etc.
enormously, extraordinarily, highly, hugely, immensely, incredibly, profoundly, terribly, tremendously, truly
critically, crucially, fundamentally, most (esp. BrE), supremely, vitally
This is most important: you must deliver the letter yourself.

especially, particularly
uniquely
Several factors make this painting uniquely important.

increasingly
doubly
equally
These two factors are equally important.

fairly, pretty, quite
obviously
sufficiently
He considered the matter sufficiently important to call her at home.

internationally (esp. BrE)
an internationally important site for these rare birds

economically, functionally, historically, politically, strategically
historically important buildings

for
It's important for you to understand this.

to
Spending time with my children is important to me.
The work of the intelligence services was crucially important to victory in the war.

Important is used with these nouns:
achievement, addition, adjustment, advance, advantage, ally, amendment, appointment, area, aspect, asset, assignment, attribute, battle, bearing, book, breakthrough, business, category, cause, centre, ceremony, change, characteristic, client, clue, collection, commodity, component, composer, concept, concession, consequence, consideration, constituency, constraint, contract, contribution, contributor, crossroads, customer, decision, detail, development, difference, dimension, directive, discovery, distinction, document, effect, element, engagement, event, evidence, exception, exhibition, export, facet, fact, factor, feature, festival, figure, find, finding, fixture, focus, forum, function, gap, goal, guest, habitat, impact, implication, improvement, incentive, indication, indicator, industry, influence, information, ingredient, initiative, innovation, input, insight, instrument, issue, item, job, landmark, lesson, limitation, link, match, matter, measure, meeting, message, milestone, mineral, modification, moment, monument, move, news, niche, objective, observation, occasion, office, omission, organ, parallel, part, people, person, personality, phase, philosopher, piece, place, point, pointer, position, precedent, prerequisite, problem, project, property, qualification, quality, question, reason, recommendation, reform, reminder, repercussion, report, requirement, resource, respect, responsibility, role, ruling, save, sector, shift, site, skill, source, stage, step, strand, symbol, target, task, theme, thing, tool, topic, trend, truth, turning point, undertaking, vehicle, victory, virtue, visitor, vitamin, vote, watershed, way, work, writer