'out of the blue' definitions:

Definition of 'out of the blue'

adverb

In a way that was not expected; "her brother showed up at the wedding out of the blue" [syn: unexpectedly, out of the blue]

adjective

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" [syn: unanticipated, unforeseen, unlooked-for, out of the blue(p)]

Synonyms of 'out of the blue'

From: Moby Thesaurus

extraordinary,
improbable,
more than expected,
out-of-the-way,
past expectation,
sudden,
unannounced,
unanticipated,
undivined,
unexpected,
unforeseeable,
unforeseen,
unguessed,
unheralded,
unhoped for,
unpredictable,
unpredicted,
unprepared for,
without warning

Words containing 'out of the blue'

Blue,
blueing,
blues,
Berlin blue,
Big Blue,
Blue Ash,
Blue Bell,
Blue Diamond,
Blue Earth,
Blue Eye,
Blue Grass,
Blue Hill,
Blue Hills,
Blue Island,
Blue Lake,
Blue Monday,
Blue Mound,
Blue Mounds,
Blue Mountain,
Blue Peter,
Blue Point,
Blue Rapids,
Blue Ridge,
Blue River,
Blue Springs,
Blue asbestus,
Blue black,
Blue blood,
Blue bonnet,
Blue book,
Blue buck,
Blue cod,
Blue crab,
Blue curls,
Blue devils,
Blue fire,
Blue gage,
Blue gum,
Blue jack,
Blue jacket,
Blue jaundice,
Blue jay,
Blue laws,
Blue light,
Blue mantle,
Blue mass,
Blue mold,
Blue mould,
Blue ointment,
Blue perch,
Blue pigeon,
Blue pill,
Blue print,
Blue ribbon,
Blue ruin,
Blue spar,
Blue stocking,
Blue stone,
Blue tangle,
Blue thrush,
Blue verdigris,
Blue verditer,
Blue vitriol,
Blue water,
Blue wren,
Cobalt blue,
Coventry blue,
Indigo blue,
Mazarine blue,
Methylene blue,
Mineral blue,
Mountain blue,
Naphthol blue,
Navy blue,
Prussian blue,
Pure blue,
Saxon blue,
Sevres blue,
Sky blue,
Thenard's blue,
Thumb blue,
To look blue,
True blue,
Turnbull's blue,
Verditer blue,
Williamson's blue,
azodiphenyl blue,
bavarian blue,
black and blue,
blue air,
blue angel,
blue baby,
blue bass,
blue beech,
blue bice,
blue bindweed,
blue bugle,
blue bull,
blue cat,
blue catfish,
blue cheese,
blue chip,
blue cohosh,
blue columbine,
blue copperas,
blue coral,
blue daisy,
blue darter,
blue devil,
blue elder,
blue elderberry,
blue fig,
blue flag,
blue fleabane,
blue fox,
blue funk,
blue goose,
blue grama,
blue green,
blue in the face,
blue jasmine,
blue jean,
blue jeans,
blue jessamine,
blue jet,
blue joke,
blue language,
blue law,
blue lotus,
blue mahoe,
blue marguerite,
blue marlin,
blue mockingbird,
blue moon,
blue movie,
blue murder,
blue nile,
blue note,
blue orchid,
blue pea,
blue peafowl,
blue pencil,
blue petrel,
blue pickerel,
blue pike,
blue pikeperch,
blue pimpernel,
blue pointed,
blue poppy,
blue racer,
blue roach,
blue runner,
blue sage,
blue shark,
blue skullcap,
blue sky,
blue snowbird,
blue star,
blue stem,
blue story,
blue streak,
blue succory,
blue sunfish,
blue thistle,
blue tit,
blue toadflax,
blue tulip,
blue velvet,
blue wall,
blue walleye,
blue weed,
blue whale,
bright blue,
bromophenol blue,
bromothymol blue,
bromphenol blue,
bromthymol blue,
cerulean blue,
danish blue,
dark blue,
dress blues,
french blue,
greenish blue,
iron blue,
kentucky blue,
once in a blue moon,
pale blue,
peacock blue,
powder blue,
purplish blue,
reddish blue,
rhythm and blues,
royal blue,
steel blue,
ultramarine blue,
blue bluish light-blue dark-blue,
Blue Ash, OH,
Blue Bell, PA,
Blue Berry Hill,
Blue Diamond, NV,
Blue Earth County,
Blue Earth, MN,
Blue Eye, AR,
Blue Eye, MO,
Blue Grass, IA,
Blue Hen State,
Blue Hen's Chickens,
Blue Hill, NE,
Blue Hills, CT,
Blue Island, IL,
Blue Lake, CA,
Blue Mound, IL,
Blue Mound, KS,
Blue Mound, TX,
Blue Mounds, WI,
Blue Mountain, AL,
Blue Mountain, AR,
Blue Mountain, MS,
Blue Point, NY,
Blue Rapids, KS,
Blue Ridge Manor,
Blue Ridge, AL,
Blue Ridge, GA,
Blue Ridge, TX,
Blue Ridge, VA,
Blue River, CO,
Blue River, WI,
Blue Springs, AL,
Blue Springs, MO,
Blue Springs, MS,
Blue Springs, NE,
Blue-blooded,
Blue-bonnet,
Blue-eye,
Blue-eyed,
Blue-john,
Blue-skylaw,
Blue-veined,
Kentucky blue grass,
Sanders-blue,
Saunders-blue,
Sky-blue,
Smalt-blue,
True-blue,
black-and-blue,
blue african lily,
blue cardinal flower,
blue channel cat,
blue channel catfish,
blue cheese dressing,
blue collar worker,
blue false indigo,
blue mold fungus,
blue mountain tea,
blue point siamese,
blue ribbon commission,
blue ribbon committee,
blue ribbon jury,
blue ridge mountains,
blue sky law,
blue wall of silence,
blue-belly,
blue-black,
blue-blind,
blue-blindness,
blue-bottle,
blue-chip,
blue-collar,
blue-flowered,
blue-fruited,
blue-gray,
blue-green,
blue-grey,
blue-lilac,
blue-pencil,
blue-purple,
blue-ribbon,
blue-sky,
blue-violet,
blue-white,
colorado blue spruce,
dark-blue,
french ultramarine blue,
gray-blue,
grayish-blue,
great blue heron,
great blue shark,
grey-blue,
greyish-blue,
insoluble Prussian blue,
kentucy blue grass,
kerry blue terrier,
light-blue,
like blue murder,
lilac-blue,
little blue heron,
mauve-blue,
mountain blue berry,
peacock-blue,
powdery-blue,
purple-blue,
purplish-blue,
rhythm and blues musician,
rhythm-and-blues,
silver-blue,
silvery-blue,
southern blue flag,
violet-blue,
wild blue yonder,
wooly blue curls,
azure cerulean sky-blue bright blue,
Blue Berry Hill, TX,
Blue Earth County, MN,
Blue Ridge Manor, KY,
Blue-eyed grass,
Blue-grass State,
Blue-throated robin,
baby blue-eyes,
baby-blue-eyes,
black-and-blue livid,
blue-back mullet,
blue-bellied lorikeet,
blue-bellied parrot,
blue-chip stock,
blue-eyed mary,
blue-footed booby,
blue-green alga,
blue-green algae,
blue-headed vireo,
blue-throated warbler,
blue-winged teal,
yellow-blue dichromacy,
blue-eyed african daisy,
blue-eyed yellow warbler,
maiden blue-eyed mary,
yellow-blue color blindness,
blae bluish-black or gray-blue,
Polemonium coeruleum having corymbs of drooping flowers usually blue Gray,
propertyless wage-earning working-class blue-collar