The antonyms for the phrase 'be whiskered' could be "be smooth-shaven" or "be clean-shaven." These words indicate the opposite of having a beard, mustache, or any facial hair. Being smooth-shaven, especially for men, is often associated with a clean, professional look. It can also suggest a youthful appearance, as teenagers and young adults are less likely to have facial hair. On the other hand, certain cultures may value or celebrate facial hair as a sign of maturity, wisdom, or masculinity. Nonetheless, if you are looking for an antonym for 'be whiskered,' being smooth-shaven should fit the bill.