Collocations for urgent - adj.

be, seem, sound
Can you come to the phone—it sounds urgent.

become

extremely, fairly, very, etc.
Don't forget that one, it's rather urgent.

increasingly
the increasingly urgent political situation at home

Urgent is used with these nouns:
action, appeal, appointment, attention, business, call, consideration, demand, desire, matter, measure, meeting, message, necessity, need, plea, priority, problem, repair, request, review, shake-up, step, summons, talk, task, tone, treatment, voice, warning, whisper