Warning adjectives are listed in this post. Each word below can often be found in front of the noun warning in the same sentence. This reference page can help answer the question what are some adjectives commonly used for describing WARNING.
additional, adequate, advanced, affectionate, airborne, ample, angry, anonymous, apparent, appropriate, audible, awful, big, blunt, brief, cautionary, certain, chilling, clear, common, constant, dark, definite, dire, direct, distinct, divine, dreadful
due, earlier, earliest, early, earnest, effective, effectual, emphatic, enough, explicit, express, fair, faithful, familiar, famous, fearful, few, final, first, formal, friendly, full, further, general, gentle, global, good, grave
great, grim, heavenly, horrid, immediate, implicit, important, impressive, initial, inner, internal, last, least, legal, little, long, loud, low, major, many, mild, minute, moral, more, much, mysterious, necessary, new
obvious, occasional, official, old, ominous, only, oral, other, own, particular, perpetual, personal, plain, possible, potential, powerful, practical, preliminary, prescient, present, previous, prior, private, proper, prophetic, public, quick, raid
real, reasonable, red, repeated, sad, salutary, same, seasonable, second, secret, serious, several, severe, sharp, short, shrill, significant, silent, similar, simple, single, slight, slightest, small, sober, soft, solemn, special
specific, stark, stern, strange, strict, strong, subtle, such, sudden, sufficient, supernatural, terrible, third, timely, unheeded, unmistakable, urgent, useful, usual, vague, veiled, verbal, whispered, wholesome, written, yellow
Hope this word list had the adjective used with warning you were looking for. Additional describing words / adjectives that describe / adjectives of various nouns can be found in the other pages on this website.