Adjective
1. not expected or anticipated;
"unexpected guests""unexpected news"2. not foreseen;
"unsuspected difficulties arose""unsuspected turnings in the road"3. made necessary by an unexpected situation or emergency;
"a forced landing"4. causing surprise or amazement by not being expected;
"the curtains opened to reveal a completely unexpected scene"5. not planned;
"an unexpected pregnancy"6. happening or coming quickly and without warning;
"a sudden unexpected development"