1The unctuous tone of the salesperson made me feel uneasy about the purchase.
2Is it possible to be genuinely friendly and enthusiastic without coming across as unctuous or insincere?
3The politician's unctuous speech about the importance of public service was met with skepticism by many in the audience.
4Avoid being unctuous in your job interview; show genuine interest in the company and the position.
5There is a fine line between being charming and being unctuous; the former is endearing, while the latter is off-putting.