悪しからず
あしからず · ashikarazu · JLPT N1 · adverb
don't take me wrong
悪し (bad) + から + ず (not): it is not bad, so please do not take offense
Ashi means bad, and the -zu ending is negative, so the old sense is not bad. Say it before a blunt remark to soften it, or as a polite apology.