Specious
Part of speech: adjective
Definition: Seemingly well-reasoned or factual, but actually fallacious or insincere; strongly held but false. Having an attractive appearance intended to generate a favorable response; deceptively attractive. Beautiful, pleasing to look at.
Insincere
Part of speech: adjective
Definition: not sincerenot serious
Example sentence: I just don't like people coming up to me and saying something. It immediately makes you become insincere. There is no way you can react to it sincerely.