Unsustainable
Adjective
UK
/ˌʌn.səˈsteɪ.nə.bəl/
US
/ˌʌn.səˈsteɪ.nə.bəl/
Level: Easy - A1 (Beginner)
Definition
Not able to be continued at the same rate or level without negative consequences.
Example
"Constant overfishing is an unsustainable practice that threatens marine ecosystems."
"The company's unsustainable growth led to major losses and staff layoffs within a year."
"Using single-use plastics daily is unsustainable and harmful to future generations."
Explanation
If something is unsustainable, it can’t keep going without causing harm or failure. It may use up resources too quickly, cost too much, or create long-term damage. This can apply to lifestyles, energy use, business strategies, or relationships. An unsustainable action might seem okay in the short term but causes problems over time.