chiasmus (en)

(noun) a rhetorical or literary figure in which words, grammatical constructions, or concepts are repeated in reverse order, in the same or a modified form; e.g. ‘Poetry is the record of the best and happiest moments of the happiest and best minds.’.

fulgent (en)

(adjective) dazzlingly bright; radiant (effulgent is a synonym)

mawkish (en)

(adjective) having an insipid often unpleasant taste / (adjective) sickly or puerilely sentimental

quiddity (en)

(noun) the inherent nature or essence of someone or something; a distinctive feature; a peculiarity