Wordweb Best for beginners, entry level learners. It offers overly simplified often inaccurate definitions. But if you pay, you will hear real human pronunciations. And it's super handy.

The below websites may or may not teach you wrong or weird English. Some of them focus on teaching you how to pass exams. Those websites where natives speakers do not exchange their views often confuse or mislead students. And the exam helping websites often teach you uniformed English which no native speakers speak. If you want to learn real English spoken by real people, avoid them.

The below websites do not teach you wrong or weird English but would mislead you. They teach you rules more than expressions, dialects, or skills of expression. If you want to learn skills, avoid them. usingenglish.com

Only for level-8-year-old or above We recommend the sites that help learners see not only what native speakers say but also what they think about what other native speakers say. What they feel and comment is more important to the language. They know better what language is more effective and powerful. They help learners decide. stackexchange.com https://www.wordreference.com/