Obstacle adjectives are listed in this post. Each word below can often be found in front of the noun obstacle in the same sentence. This reference page can help answer the question what are some adjectives commonly used for describing OBSTACLE.
additional, apparent, big, biggest, certain, chief, common, conceivable, considerable, constant, dangerous, daunting, difficult, effective, effectual, enormous, external
fatal, final, first, formidable, fresh, fundamental, further, grand, grave, great, greater, greatest, huge, human, immediate, immovable, impassable
important, insuperable, insurmountable, intervening, invincible, key, large, largest, last, least, legal, little, main, major, mechanical, mighty, military
minor, moral, more, natural, new, next, obvious, only, other, particular, permanent, physical, political, possible, potential, powerful, practical
primary, principal, real, same, second, serious, significant, single, slight, slightest, small, smallest, sole, solid, special, stubborn, substantial
such, sufficient, technical, temporary, terrible, third, tremendous, trifling, true, un, unexpected, unforeseen, unnecessary, unsurmountable, worst
Hope this word list had the adjective used with obstacle you were looking for. Additional describing words / adjectives that describe / adjectives of various nouns can be found in the other pages on this website.
Please add more adjectives to make this list more complete: