Arc adjectives are listed in this post. Each word below can often be found in front of the noun arc in the same sentence. This reference page can help answer the question what are some adjectives commonly used for describing ARC.
big, blue, broad, broken, circular, continuous, corresponding, current, curved, cycloidal, dead, deadly, degree, downward, dramatic, e, earth
electric, electrical, elliptical, english, entire, few, first, former, french, full, general, gentle, good, graceful, graduated, great, greater
high, historical, horizontal, huge, important, infinitesimal, intercepted, large, larger, last, latter, lazy, light, little, long, low, lower
many, minor, more, multiple, narrative, narrow, natural, new, open, original, other, outer, own, parabolic, perfect, poor, powerful
red, reflex, same, second, semicircular, shallow, short, single, slight, slow, small, smaller, smallest, smooth, subtended, such, sweeping
third, tight, upward, vast, vertical, voltaic, wc, white, whole, wicked, wide, wider, winch, young
Hope this word list had the adjective used with arc you were looking for. Additional describing words / adjectives that describe / adjectives of various nouns can be found in the other pages on this website.