Antonyms of adj user-friendly

1 sense of user-friendly

Sense 1
user-friendly -- (easy to use)

INDIRECT (VIA easy) -> difficult, hard -- (not easy; requiring great physical or mental effort to accomplish or comprehend or endure; "a difficult task"; "nesting places on the cliffs are difficult of access"; "difficult times"; "why is it so hard for you to keep a secret?")

Similarity of adj user-friendly

1 sense of user-friendly

Sense 1
user-friendly -- (easy to use)
       => easy (vs. difficult) -- (posing no difficulty; requiring little effort; "an easy job"; "an easy problem"; "an easy victory"; "the house is easy to heat"; "satisfied with easy answers"; "took the easy way out of his dilemma")