Etymology of the French word idiosyncrasie
the French word idiosyncrasie
derived from the Greek word idiosunkrasia, ἰδιοσυγκρασία
using the Greek prefix idio-
derived from the Greek word sunkrasis, σύγκρασις
derived from the Greek word krasis, κρᾶσις
derived from the Proto-Indo-European root *kerə-
derived from the Greek word kerao
derived from the Greek word sun, σύν (together; with or together ; by association, companionship, process, resemblance, possession, instrumentality, addition, etc.)
derived from the Greek word idios, ἴδιος (pertaining to self; one's own; by implication, private or separate)