Mis-instructs can be a problematic term, as it suggests a wrong or incorrect instruction. Several synonyms are available that can help you express the same idea more accurately. Some suitable synonyms include 'misleads,' 'misguides,' 'misdirects,' 'misleads,' 'misinforms,' 'leads astray,' among others. Each of these synonyms refers to the action of giving false or incorrect advice that results in harm or confusion. When using synonyms, ensure that the context of the sentence matches the meaning of the word you wish to convey. By doing so, you ensure that your message is clear and easy to understand.