Counterchecked refers to the act of verifying or double-checking something. Its antonyms would therefore describe the opposite action, such as accepting, trusting, or assuming. Other antonyms could include disregarding, overlooking, or ignoring. In contrast to counterchecked, these antonyms imply a lack of attention to detail or a willingness to believe something without further inquiry. However, it is important to note that the opposite of counterchecked can vary depending on the context. For instance, in a security context, the antonym might be breaching or infiltrating, while in a political context, it could be cooperating or aligning.