Synonyms of idée fixe in English:

idée fixe


See definition of idée fixe

noun

1‘his other idée fixe was his belief in the existence of a ninth planet’

SYNONYMS
obsession, fixation, consuming passion, ruling passion, passion, mania, compulsion, preoccupation, enthusiasm, infatuation, addiction, fetish, craze, hobby horse
phobia, complex, neurosis
informal bee in one's bonnet, hang-up, thing, bug