The word "bribe" implies an act of corruption, illicit dealings offered or received for personal gain. Therefore, the opposite of "more bribable" would be words that connote honesty, integrity, and incorruptibility. Words such as trustworthy, honest, scrupulous, upright, aboveboard, ethical, virtuous, impartial, just, and fair come to mind. People who possess these qualities are not likely to bend their principles or compromise their position for the sake of financial gain. Choosing antonyms when discussing the theme of bribery helps to highlight the importance of upholding ethical values in all walks of life, and the need to shun corrupt practices in business and politics.