USER-FRIENDLY Synonyms: 86 Similar and Opposite Words - Merriam-Webster
https://www.merriam-webster.com/thesaurus/user-friendly
WEBSynonyms for USER-FRIENDLY: accessible, friendly, painless, smooth, idiotproof, uncomplicated, gentle, soothing; Antonyms of USER-FRIENDLY: difficult, challenging, rigorous, formidable, heavy, laborious, tough, rugged
DA: 80 PA: 90 MOZ Rank: 22