IPA: /ˈɒstrəˌsaɪzd/
KK: /ˈɑstrəˌsaɪzd/
Excluded from a group or society, often as a form of punishment or social rejection.
After the scandal, he felt ostracised by his former friends.
Ostracised → It is formed from "ostrakon" (Greek, meaning shell or potsherd) and the suffix "-ise" (meaning to make or become). The term originally referred to the practice in ancient Athens of voting to exile a citizen by writing their name on a piece of pottery, thus meaning to make someone an outcast or to exile them.
Imagine a shell ('ostrakon') being used to vote someone out, which helps you remember that 'ostracised' means to make someone an outcast.
No commonly confused words.