There are many synonyms for the phrase "be wary of". Some of the most commonly used alternatives include "be cautious of", "be careful of", "be on guard against", "be watchful of", "be alert to", "be mindful of", "be suspicious of", and "be apprehensive of". These phrases all convey a sense of caution, wariness, or scepticism about a particular situation, person, or thing. Whether you're advising a friend to be careful of a potential scam, warning a colleague to be on guard against a difficult client, or reminding yourself to be watchful of your own behaviour, these synonyms can help you choose exactly the right phrase for the situation.