(bound form) used in the word 忐忑 tǎn​tè, meaning nervous or uneasy

(bound form) used in the compound 忐忑 tǎn​tè to describe being nervous or unsettled

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

peaceful; quiet; calm; stable; secure; safe; in good health