barba tenus sapiens

Etymology
From + , i.e. 'wise only as far as the beard, merely cultivating an appearance of wisdom'. From Erasmus' Adagia, translating, part of a rich earlier tradition of similar sayings in reference to the beard conferring the image of a philosopher, specifically a Stoic one. Cf. (Horace),.

Noun

 * 1)  a phoney philosopher, a sophist