RedFox sanakirja also gives you the context
Merriam-Webster's Learner's Dictionary explains words in easy English
Wordhippo.com gives you synonyms and antonyms
https://www.sanakirja.org/ - a simple dictionary
LIST OF SYNONYMS: synonyms for the most common 100 words (scroll down a bit for the list)
do NOT use Google translate. You'll come to rely on it too much, and will be in trouble when you don't have access.
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