To use up foolishly or needlessly
To spend (money) excessively and usually foolishly
Excessive or imprudent expenditure
In spite of his somewhat extravagant living, he left an ample fortune to his spendthrift son, who did his best to squander it as soon as possible.
It's so easy to squander valuable time browsing social media.
When you go to Las Vegas, try not to squander your money in the casinos. Go see a show!
Amelia tried her hardest not to squander her attention on people that would not return it.
Do not squander the time you have for the test because there are many questions to answer.