(bound form) a flaw or spot in a piece of jade

Negative adverb used before verbs, adjectives, and other adverbs to indicate negation; also used as a bound-form prefix to form terms with opposite meanings

to cover up; to hide or conceal; to shield from view

the luster of gems; (metaphorically) a person's virtues or strengths, often contrasted with 瑕 xiá