Blunder adjectives are listed in this post. Each word below can often be found in front of the noun blunder in the same sentence. This reference page can help answer the question what are some adjectives commonly used for describing BLUNDER.
absurd, awful, bad, big, biggest, colossal, common, curious, diplomatic, disastrous
economic, egregious, enormous, extraordinary, fatal, first, foolish, gigantic, grammatical, grave
great, greater, greatest, grievous, gross, historical, huge, inexcusable, ludicrous, major
mere, military, monstrous, obvious, own, palpable, political, ridiculous, sad, same
second, serious, similar, single, social, strange, strategic, stupendous, stupid, such
tactical, terrible, tragic, unaccountable, unfortunate, unpardonable, worst
Hope this word list had the adjective used with blunder you were looking for. Additional describing words / adjectives that describe / adjectives of various nouns can be found in the other pages on this website.