Hollow
Part of speech: verb
Definition: to make a hole in something; to excavate
Part of speech: adjective
Definition: (of something solid) Having an empty space or cavity inside. (of a sound) Distant, eerie; echoing, reverberating, as if in a hollow space; dull, muffled; often low-pitched. Without substance; having no real or significant worth; meaningless. Insincere, devoid of validity; specious.
Part of speech: noun
Definition: A small valley between mountains; "he built himself a cabin in a hollow high up in the Rockies" A sunken area in something solid. (US) A sunken area, the equivalent to a copse in British English. A feeling of emptiness.
Example sentence: We live on the circumference of a hollow circle. We draw the circumference, like spiders, out of ourselves: it is all criticism of criticism.
Insincere
Part of speech: adjective
Definition: not sincerenot serious
Example sentence: Whatever your religious tradition is, if it's important to you and you don't feel comfortable talking about it, you end up coming across as insincere.