id·i·o·syn·cra·sy /ˌɪdiəˈsɪŋkrəsi, -ˈsɪn-/ Pronunciation Key - Show Spelled Pronunciation[id-ee-uh-sing-kruh-see, -sin-] Pronunciation Key - Show IPA Pronunciation
–noun, plural -sies. 1. a characteristic, habit, mannerism, or the like, that is peculiar to an individual.
2. the physical constitution peculiar to an individual.
3. a peculiarity of the physical or the mental constitution, esp. susceptibility toward drugs, food, etc. Compare allergy (def. 1).

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pec·ca·dil·lo /ˌpɛkəˈdɪloʊ/ Pronunciation Key - Show Spelled Pronunciation[pek-uh-dil-oh] Pronunciation Key - Show IPA Pronunciation
–noun, plural -loes, -los. a very minor or slight sin or offense; a trifling fault.