Of persons, their manner, faces, etc.: Made up to a certain appearance, got up for a purpose; hence, deceitful, insincere. Obsolete.

Not plain (in various senses); esp. ornate, elaborate; (also) uneven; rough. In early use: insincere, false (see plain, adj.2 11).

figurative. Of persons and things: wanting soundness, solidity, or substance; empty, vain; not answering inwardly to outward appearance; insincere…

Having a hollow heart; insincere, false.

That conceals the true nature or intentions of someone or something; deceptive, deceitful; insincere, false. Cf. false, adj. 10a. Obsolete.

= insincere, adj. 1. Of actions, etc.

Not sincere or genuine; assuming a false guise in speech or conduct; dissembling, disingenuous. Said of persons and their actions or behaviour.

Not sincere or true.

Going no deeper than the lip; superficial.

Fake, sham, counterfeit; false; insincere.

Intellectually or socially pretentious or affected; = pseudo, adj.