1) An emergency 2) Clamant 3) Critical 4) Crying 5) Demanding attention 6) Demanding immediate attention 7) High-priority 8) Imperative 9) Insistent 10) Instant 11) Pressing 12) Requiring immediate action 13) Requiring immediate attention 14) Requiring precise accuracy 15) Requiring prompt attention 1) Demanding 2) Imperative 
• (n.) The name of a writ in proceedings before outlawry. • (n.) Exigency; pressing necessity; decisive moment. • (a.) Exacting or requiring immediate aid or action; pressing; critical.
Ex'i·gent noun 1. Exigency; pressing necessity; decisive moment. [ Obsolete] « Why do you cross me in this exigent ?» Shak. 2. (o. Eng. Law) The name of a writ in proceedings before outlawry. Abbott. Ex`i·gent adjective [ Latin exigens , - entis , present participle of exigere to drive out or forth, require, exact. See Exact .] Exacting or requiring immediate aid or action; pressing; critical. 'At this exigent moment.' Burke. 
[adj] - requiring precise accuracy
adjective requiring precise accuracy; `an exacting job`; `became more exigent over his pronunciation`
requiring immediate action or aid; urgent; pressing. · requiring a great deal, or more than is reasonable.