Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- adj. Difficult to foretell or foresee: unpredictable test results; unpredictable behavior.
- n. Something difficult or impossible to foretell or foresee.
Wiktionary
- adj. Unable to be predicted.
- n. An unpredictable thing.
WordNet 3.0
- adj. not occurring at expected times
- adj. not capable of being foretold
- adj. unknown in advance
Etymologies
- un- + predictable (Wiktionary)
Examples
“In the regulated order of the modern state, the unpredictable is the ultimate aesthetic desire.”
Vendler on Armitage: the willingness not to make a point…not to be witty
“He also called McCain "unpredictable," and questioned his knowledge on economic issues.”
“Whether it will cause massive die outs and rising ocean levels or just an increase in unpredictable weather is not 100% clear.”
“These Barbie-inspired 9-inch hard plastic dolls were designed to fly but lacked reliable controls, thus launching with incredible speed in unpredictable directions.”
“JALC's Ellis notes, If you look at people's general disposition towards culture and look at the work of Alliance Française or the Goethe Institute, you often find the impression of a country or culture becomes manifesting behavior years after, in unpredictable ways.”
The Huffington Post: Linda Constant: A Different Kind of P2P: The Rhythm Road: American Music Abroad
“JALC's Ellis notes, If you look at people's general disposition towards culture and look at the work of Alliance Française or the Goethe Institute, you often find the impression of a country or culture becomes manifesting behavior years after, in unpredictable ways.”
The Huffington Post: Linda Constant: A Different Kind of P2P: The Rhythm Road: American Music Abroad
“First, even in unpredictable environments, political professionals said, campaigns must concentrate on what can be expected and keep the rest of the organization moving forward.”
“With an all-IP 4G broadband network, how voice traffic travels across the network will likely evolve in unpredictable ways.”
“It changes the atmosphere, often in unpredictable ways.”
“In fact, history tells us that it is substantially worse when you have an artificial limitation on the supply of money – especially one that sees inflation in unpredictable ways when new shiny bead sources are discovered.”
Lists
These user-created lists contain the word ‘unpredictable’.
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EN - academic vocabulary
Use these and get promoted
abandon, abandonment, abnormally, abstract, abstraction, abstractly, abstracts, academia, academic, academically, academics, academies and 3119 more...
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Interesting words
A list of words that are odd or words that I have looked up.
concupiscence, brize, scree, scoria, forestaff, spanaemia, valetudinarianism, distasture, pyrethrum, laudanum, gentian, bicameral and 11250 more...
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africasunsets's list
serendipity, fragrance, glamour, smitten, nourish, lavish, luxury, wicked, gem, daring, soothe, fantasy and 192 more...
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Descriptive
The present, the future. Goals, wishes, hopes.
capricious, sericeous, sleek, flawless, charming, skilled, long-haired, versatile, beautiful, witty, fair, thin and 145 more...
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Fickle/Fleeting/Fractured
fleeting, transient, evanescent, ephemeral, pro tem, pro tempore, transitory, temporal, volatile, fugacious, fickle, capricious and 50 more...
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My Self-Descriptors: A Mirror of Text
Read this list, and read it well. When you finish, you'll know me better than my mother. That is, unless she reads this list too.
libertarian, unorthodox, unfinished, sincere, frugal, lanky, introspective, critical, laid-back, taciturn, lexiphilic, kindly and 115 more...
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my dictionary
able, abnormally, abroad, absent, abstract, acceptable, acceptance, access, accessible, accession, according to, account and 4551 more...
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KaeZoo's Words
flingers, unhinged, driven, flanked, arboreal, venerable, endearing, iconoclastic, fletcher, competent, fireproof, cavernous and 215 more...
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2007bee-r02
2007 Scripps National Spelling Bee Round 2
query, tendency, danceable, parachute, malignant, brutal, humanely, lyrically, deductible, shindig, gravel, embroidered and 274 more...
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I am
considering, ruined, troubled, worried, frustrated, negative, depressing, depressed, depression, sick, exhausted, alone and 59 more...
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Words to describe a person
To describe personality, characteristic, trait, behaviour, quality and attribute of a person.
impulsive, loquacious, capricious, mirthful, vivacious, serious, jocoserious, garrulous, vagarious, anxious, valorous, audacious and 64 more...
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writerhead's list
my faves
lacadazical, lascivious, presumptious, unpredictable, inclement, exemplary, nascent, scoundrel, insipient, bilious, cacophany, insolent and 2 more...
Tweets
Looking for tweets for unpredictable.

PossibleUnderscore "You can't tell what he might do."
- Lord of the Flies Jul 26, 2009