Useful for browsing, but frustrating for quick lookup. Better to buy a used physical copy ($5–15) or use a digital dictionary app.
Let’s address the elephant in the room. As a content creator and ethical language learner, you need to understand copyright law.
If you find a clean, searchable, full-color PDF—exclusive or otherwise—treat it as a golden ticket. However, always attempt to support the publisher when possible. The value of the content is high enough that buying a used physical copy or opting for the digital app version of its successor is a worthwhile investment in your future fluency.
Corpus-based examples show authentic English, and how words are used in context, to help you develop natural English. Mind Mover Publishing House, Inc. Longman Wordwise Dictionary - Google Books
: The Longman Dictionary of Contemporary English Online is a powerful, free alternative that includes audio pronunciations and example sentences.