🇬🇧🇪🇸 unsustainable - insostenible : English Lesson

Meaning of "unsustainable" ("insostenible"), detailed definition, and a short video lesson below.

Unsustainable describes something that cannot be kept going at the same rate or level because it uses up too many resources or causes too much damage. This term is often used to talk about practices that harm the environment or deplete resources faster than they can be replenished.

Watch and listen to this English flashcard to understand the word in more detail, with an easy example sentence.

My unsustainable habit of staying up all night watching cat videos turned me into a very sleepy zombie.

The snowman's decision to sunbathe in July was an unsustainable activity.

Trying to balance 15 books on my head while riding a bike was clearly an unsustainable plan.

Trying to build a castle out of jelly was fun but unsustainable—it collapsed after one wobbly minute.

The tower of cookies balanced on a single grape was clearly an unsustainable snack arrangement.

She fed the fireplace night after night; the warmth felt unsustainable. The wood pile shrank, the heat bill rose. Friends warned the habit was unsustainable, the money unsustainable, the smoke unsustainable, and the roof sagged from soot—clearly unsustainable. She closed the door, hugged a wool blanket, and laughed with relief.

This word is at the C2 level, which means it represents the highest mastery of English. It’s often used in specialized or highly formal contexts and helps you communicate with precision and subtlety, much like a native speaker.

Expanding your English vocabulary is one of the best ways to improve your pronunciation, spelling, and confidence in English. Watch the video above to memorize the word, understand its meaning, and see example sentences in action. Discover related words to grow your vocabulary naturally. Add words to your playlist for stress-free, effective learning—anytime, anywhere! Watch, learn, repeat.