Meaning of “unpredictable” in the English Dictionary

"unpredictable" in British English

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unpredictableadjective

uk /ˌʌn.prɪˈdɪk.tə.bəl/ us /ˌʌn.prɪˈdɪk.tə.bəl/

B2 likely to change suddenly and without reason and therefore not able to be predicted (= expected before it happens) or depended on:

The weather there can be unpredictable - one minute it's blue skies and the next minute it's pouring rain.
The hours in this job are very unpredictable - you sometimes have to work late at very short notice.

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unpredictability
noun [ U ] uk /ˌʌn.prɪˌdɪk.təˈbɪl.ə.ti/ us /ˌʌn.prɪˌdɪk.təˈbɪl.ə.t̬i/
unpredictably
adverb uk /ˌʌn.prɪˈdɪk.tə.bli/ us /ˌʌn.prɪˈdɪk.tə.bli/

(Definition of “unpredictable” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"unpredictable" in American English

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unpredictableadjective

us /ˌʌn·prɪˈdɪk·tə·bəl/

tending to change suddenly and without reason or warning, and therefore not able to be depended on:

unpredictable weather
The world is pretty unpredictable.
unpredictability
noun [ U ] /ˌʌn·prɪˌdɪk·təˈbɪl·ət̬·i/

(Definition of “unpredictable” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"unpredictable" in Business English

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unpredictableadjective

uk /ˌʌnprɪˈdɪktəbl/ us

if something is unpredictable, it is likely to change suddenly and unexpectedly, so cannot be planned for:

To protect it from the unpredictable nature of software sales, the company has adopted a new business model.
unpredictable effects/events/factors Unpredictable events can have a huge impact on bond values.
It is a very unpredictable market.
The turmoil on Wall Street is emblematic of how the credit mess is spreading in unpredictable ways.
an unpredictable outcome/result
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unpredictability
noun [ U ]

Stocks carry more risks than bonds because of the unpredictability of corporate profits.
unpredictably
adverb

When share prices go up and down unpredictably, investors tend to sit on their hands.

(Definition of “unpredictable” from the Cambridge Business English Dictionary © Cambridge University Press)