blatant, conspicuous, flagrant, glaring, gross, obvious, patent, pronounced, rank, striking

arresting, clear, distinct, dramatic, emphatic, evident, eye-catching, marked, notable, noticeable, outstanding, plain, prominent, remarkable, salient, showy, splashyabsolute, arrant, downright, out-and-out, outright, sheer, stark, utterdetectable, discernible(also discernable), observable, perceptible, visibleabominable, atrocious, awful, deplorable, execrable, heinous, lousy, monstrous, outrageous, preposterous, shameful, shocking, terrible, wretched

imperceptible, inconspicuous, unnoticeable, unobtrusiveinconsequential, inconsiderable, insignificant, slight, small, trifling, trivialconcealed, hidden, invisible