The antonym of the word 'innocent' is 'guilty'. It is a common term used in law and justice for individuals who have been proven or accused of committing a criminal offense. Additionally, the adjective 'culpable' can be considered as an antonym of 'innocent', which implies being responsible or guilty for an action or mistake. Furthermore, 'corrupt' and 'immoral' are also antonyms of 'innocent' because they suggest wickedness, deceit, or misconduct. Conversely, terms such as 'honest', 'pure', 'virtuous', and 'upright' are synonyms of 'innocent' because they connote a lack of wrongdoing or malice.