Difficult to use, especially for an untrained user.(adjective)
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Use "user-hostile" in a sentence
"That's what I mean by being a user-hostile format."
"The files are very small in their proprietary format, but that format is otherwise user-hostile, so I convert the files to MP3's, which tend to be 3 or 4 times larger."
"Lisa Spangenberg, #193: "Random House who have gotten increasingly difficult about DRM and wanted ebooks with any of their content, even if it's a tiny percentage, to be locked down with ridiculous user-hostile and support-hostile DRM""