What is the opposite of user-friendly?

Need antonyms for user-friendly? Here's a list of opposite words from our thesaurus that you can use instead.

Opposite of designed to be easy for an untrained user to use
Opposite of able to be comprehended
Opposite of needing very little effort
“The climb was difficult, for there was only a narrow pathway between and around rugged rock outcroppings.”
Opposite of extremely clear in style and meaning
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