Unsustainably
/ˌʌnsəˈsteɪnəbli/
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Definition
(adv) In an unsustainable manner
Sentence Examples
The company was growing unsustainably and risked failing very soon.
Using resources unsustainably will lead to problems in the future.
CEFR Practice Quiz
The company was operating ____, which meant it was only a matter of time before it faced serious financial problems today.