Mistakes adjectives are listed in this post. Each word below can often be found in front of the noun mistakes in the same sentence. This reference page can help answer the question what are some adjectives commonly used for describing MISTAKES.
absurd, actual, alleged, avoidable, awful, awkward, bad, basic, big, biggest, careless, certain, clerical, common, commonest, constant, correct, costly, countless, critical, curious, dangerous
disastrous, dreadful, dumb, earlier, early, egregious, embarrassing, endless, enough, even, expensive, extraordinary, factual, fatal, few, fewer, fewest, financial, first, foolish, former, frequent
fundamental, further, future, glaring, grammatical, grave, gravest, great, greater, greatest, grievous, gross, historical, honest, horrible, huge, human, important, individual, inevitable, initial, innocent
innumerable, less, like, little, ludicrous, major, many, medical, mental, mere, military, minor, more, most, new, numerous, obvious, occasional, old, only, other, own
painful, palpable, past, personal, political, popular, possible, potential, practical, previous, real, ridiculous, sad, same, serious, several, significant, silly, similar, simple, slight, small
social, strange, strategic, stupid, such, tactical, technical, terrible, tragic, trivial, typographical, unavoidable, unfortunate, unintentional, unnecessary, various, verbal, very, worse, worst
Hope this word list had the adjective used with mistakes you were looking for. Additional describing words / adjectives that describe / adjectives of various nouns can be found in the other pages on this website.