Feat adjectives are listed in this post. Each word below can often be found in front of the noun feat in the same sentence. This reference page can help answer the question what are some adjectives commonly used for describing FEAT.
acrobatic, amazing, architectural, astonishing, astounding, athletic, brilliant, clever, common, considerable, crowning, dangerous, daring
difficult, easy, extraordinary, famous, fine, first, gallant, glorious, grand, great, greater, greatest, gymnastic
herculean, heroic, impossible, impressive, incredible, intellectual, last, latter, literary, little, magnificent, major, marvellous
marvelous, mean, mighty, military, miraculous, monumental, new, next, noble, notable, other, particular, perilous
physical, prodigious, rare, real, remarkable, same, similar, simple, singular, small, spectacular, splendid, successful
such, superhuman, surprising, technical, technological, terrible, tremendous, unprecedented, unusual, warlike, wonderful, wondrous
Hope this word list had the adjective used with feat you were looking for. Additional describing words / adjectives that describe / adjectives of various nouns can be found in the other pages on this website.