1. obvious
2. apparent, evident, manifest, patent, plain, axiomatic, self-evident, taken for granted, demonstrable, provable, frank, open-and-shut, self-explanatory, transparent, writ large, perceptible
3. palpable, tangible, conspicuous
4. attention-getting, eye-catching, big, large, prominent, bold, crying, egregious, flagrant, glaring, gross, rank, featured, in evidence, marked, outstanding, prominent, salient, spectacular, striking, indiscreet, visible
4. overt, open