Calm adjectives are listed in this post. Each word below can often be found in front of the noun calm in the same sentence. This reference page can help answer the question what are some adjectives commonly used for describing CALM.
absolute, apparent, awful, beautiful, blessed, breathless, certain, comparative, complete, dead, deadly, deceitful, deceptive, deep
delicious, dignified, divine, eerie, eternal, everlasting, false, flat, forced, gentle, golden, great, greater, habitual
halcyon, heavenly, holy, icy, imperturbable, infinite, inner, inward, like, little, long, majestic, mental, momentary
more, olympian, ominous, outward, own, peaceful, perfect, perpetual, philosophic, placid, political, present, preternatural, profound
quiet, relative, religious, sacred, same, serene, settled, silent, solemn, soothing, spiritual, stately, still, stoic
strange, sudden, sweet, temporary, treacherous, unbroken, uneasy, universal, unnatural, unruffled, usual, wonderful, wonted
Hope this word list had the adjective used with calm you were looking for. Additional describing words / adjectives that describe / adjectives of various nouns can be found in the other pages on this website.