IPA: //ˌʌn.səˈpraɪzd//
KK: /ʌnˈsɜrˌpraɪzd/
Not feeling surprise; having expected something to happen.
She was unsurprised by the news of his resignation.
Unsurprised → It is formed from "un-" (meaning not) and "surprised" (from Old French *surprendre*, meaning to seize or take by surprise). The word "unsurprised" means not taken by surprise or not caught off guard.
Think of 'not' ('un-') being added to 'taken by surprise' ('surprised') — that's why unsurprised means not being surprised.