When expressing doubt or uncertainty about a statement or fact, one can use synonyms for the phrase "not actually". Some of these synonyms include "not really", "not truly", "not in fact", "not verily", "not certifiably", "not absolutely", and "not entirely". These phrases can help to convey a sense of hesitation or caution when discussing something that may require further investigation or clarity. Using synonyms for "not actually" can also help to avoid making bold claims or assumptions that could later be proven false. Ultimately, selecting the right synonym for "not actually" depends on the context and tone desired by the speaker or writer.