unexpected

adjectives

not expected or anticipated

"unexpected guests"; "unexpected news"

unexpected

is derived from

unexpectedness

antonym

expected

is similar to

without warning or announcement

"they arrived unannounced"; "a totally unheralded telegram that his daughter...died last night"- M.A.D.Howe

unannounced, unheralded, unpredicted

is similar to

not anticipated

"unanticipated and disconcerting lines of development"- H.W.Glidden; "unforeseen circumstances"; "a virtue unlooked-for in people so full of energy"; "like a bolt out of the blue"

out of the blue, unanticipated, unforeseen, unlooked-for

is similar to

so unexpected as to have not been imagined

"an unhoped-for piece of luck"; "an unthought advantage"; "an unthought-of place to find the key"

unhoped, unhoped-for, unthought, unthought-of

is similar to

not prepared or ready for

unprovided for

is similar to

used of an unexpected defeat of a team favored to win

"the Bills' upset victory over the Houston Oilers"

upset