The phrase 'fast and loose' is generally used in reference to a person who is dishonest or manipulative. However, there are a number of synonyms for this phrase that can help to convey this sentiment in different ways. For example, 'deceitful' and 'manipulative' both imply a level of dishonesty, while 'untrustworthy' and 'shifty' suggest that the person in question cannot be relied upon. Other synonyms for 'fast and loose' include 'dishonest', 'fraudulent', 'sly', and 'crafty'. Each of these words can help to paint a picture of a person who is not to be trusted, allowing the speaker or writer to convey a particular sense of moral judgement.