Reverse Dictionary: UNEXPECTED

ADJECTIVES
► ARSE ABOUT FACE contrary to what is usually, expected or logical; confused, muddled perverse → 1923 UK sl.
► ARSEWARD contrary to what is usual, expected, or logical; back-to-front, muddled, perverse → c1386
► BEYOND THE BEYOND unexpected, incredible, out of the way → 1898 N. Ireland (Bk.)
► BIZOTIC unexpected, out of the ordinary, weird → 1984 US teen & high school sl.
► FUNNY odd, peculiar, strange; interesting, surprising, unexpected → 1793 colloq.
► OFF THE WALL irrelevant, unexpected → 1981 sl., orig. US
► RANDOM spontaneous, unexpected → 1980s US students’ & teen sl.
► SUBITANEOUS sudden, hasty, unexpected; hastily produced or constructed → 1651
► SUBITANY sudden, hasty, unexpected; hastily produced or constructed → 1603 obs.
► UNASPECTED unsuspected, unexpected → 1578 obs.
► UNBIWENE unexpected → c1250 obs.
► UNSIGHTED unforeseen; unexpected → 1903 Amer. dial.

ADVERBS
► ALL OF A HOT suddenly, unexpectedly → 1895 Eng. dial.
► ALL OF AN UPSHOT unexpectedly → 1895 Eng. dial.
► ARSEY-VERSEY ► ARSIE-VARSIE ► ARSEY-VARSEY ► ARSY-VARSY ► ARSY-VERSY in a manner contrary to what is usual, expected, or logical → 1542 UK sl.
► IN AN UNPLUNGE suddenly, unexpectedly → 1905 Eng. dial. (Bk.)
► OUT OF THE BLUE without warning, completely unexpectedly → 1879 
► SLAP quickly, unexpectedly, suddenly → L17 sl.
► UNADVISEDLY without warning; unexpectedly → c1535 obs.
► UNBETHOUGHT unintentionally, unexpectedly → 1823 Eng. dial.
► UNMUNDLUNGE unexpectedly → a1225 obs.

INTERJECTIONS
► SOHO! an exclamation announcing the discovery of something unexpected

NOUNS
► BOLT FROM THE BLUE a sudden and unexpected event; a complete surprise → 1881
► BOLT OUT OF THE BLUE a sudden and unexpected event; a complete surprise → 1837
► CURVEBALL something whose unexpectedness or unpredictable nature enables one to disorient or wrong-foot one’s opponents; generally, something unexpected, surprising, or disorienting → 1936 orig US
► NAP-TAKING that takes one napping; unexpected → 1602 obs.
► SHELL-SHOCKER something that causes severe shock or surprise; an unexpected or startling event, revelation, etc. → 1935
► SUDDENTY suddenness, unexpectedness → 1388 chiefly Sc. obs.
► TURN-UP an unexpected piece of good luck; any unexpected turn of events → 1873 sl.
► TURN-UP FOR THE BOOKS, A an unexpected piece of good luck; any unexpected turn of events → 1873 sl.
► TWISTEROO an unexpected twist; a narrative with an  unexpected twist → 1963 colloq.
► ZINGER a surprise; an awkward or unexpected turn of events → 1973 US sl.

VERBS
► BLOW IN WITH THE TUMBLEWEEDS to come unexpectedly → 1945 US Western usage (Bk.)
► DROP A BOMBSHELL to make a startling or unexpected announcement → Aust. sl.