EXIGENT

urgent, pressing

requiring immediate action or attention
"regarded literary questions as exigent and momentous"
requiring precise accuracy
"Became more exigent over his pronounciation."

SYN - crying, insistent, exacting
ANT - beseeching, imploring

"He knew he must address this exigent matter soon or it would be too late."

"He was overwhelmed by how many so-called exigent matters he was supposed to deal with during his first few days in office."

"With his students he was exigent about their evaluations of the specimens."

"He knew that he had to be more exigent with his driving if he was ever to win back the trust of his mother after the accident"

"Even when dealing with exigent matters such as these he was exigent over his work."