Final answer:
A charlatan is a person who pretends to have knowledge or skills they do not possess, and thus would not be sought after for advice. Conversely, guru, sage, and mentor are roles associated with providing trustworthy guidance.
Step-by-step explanation:
The term someone might be branded as to indicate that they would not be sought out for sound advice is a charlatan. A charlatan is a person who falsely pretends to know or be something to deceive people. In contrast, a guru, a sage, and a mentor are all terms associated with wisdom and trusted advice. A guru is an expert or teacher, a sage is a wise person, and a mentor is an experienced advisor.