Said of animate beings
impetuously, headlong, intrepidly, fearlessly, with hardihood, recklessly, courageously, bravely, dauntlessly, daringly, forwardly, venturesomely, valiantly, stoutly, resolutely, brazenly, audaciously, saucily, firmly.
Antonyms cowardly*, fearfully, cravenly, cautiously.
Said of inanimate objects
prominently, conspicuously, saliently, sharply, clearly, plainly, openly, abruptly, steeply, eminently, vividly, strongly, palpably, commandingly, compellingly, showily, strikingly.
Antonyms obscurely*, inconspicuously, unobtrusively.