1. Distinctive, peculiar, or unique personal characteristics, behaviors, or mannerisms that are specific to an individual and often unusual or eccentric
Her idiosyncratic traits, like collecting vintage buttons, made her memorable to everyone she met.
Suas características idiossincráticas, como colecionar botões vintage, a tornavam memorável para todos que conheciam.
2. Individual quirks or unusual habits that differentiate a person from others
The author's idiosyncratic traits are evident in his unconventional writing style.
As características idiossincráticas do autor são evidentes em seu estilo de escrita não convencional.