- clamant, crying, exigent, insistent, instant - demanding attention; "clamant needs"; "a crying need"; "regarded literary questions as exigent and momentous"- H.L.Mencken; "insistent hunger"; "an instant need"
Antonym: beseeching (indirect, via imperative)
- exigent, exacting - requiring precise accuracy; "an exacting job"; "became more exigent over his pronunciation"
Antonym: undemanding (indirect, via demanding)