[{"word":"costliest","phonetics":[],"meanings":[{"partOfSpeech":"adjective","definitions":[{"definition":"Of high cost; expensive.","synonyms":[],"antonyms":[],"example":"a costly activity"}],"synonyms":[],"antonyms":["costlessly"]}],"license":{"name":"CC BY-SA 3.0","url":"https://creativecommons.org/licenses/by-sa/3.0"},"sourceUrls":["https://en.wiktionary.org/wiki/costliest","https://en.wiktionary.org/wiki/costly"]}]