WordWeb Online

1. 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";
   - hard
    
2. Hard to control
   "a difficult child";
   - unmanageable

See also: ambitious, arduous, awkward, baffling, catchy, challenging, defiant, delicate, demanding, difficultness, difficulty, disobedient, effortful, elusive, embarrassing, exacting, fiendish, fix [informal], fractious, hard, hard-fought, herculean, hole [informal], incorrigible, indocile, intractable, jam [informal], kettle of fish [informal], knotty, mess [informal], muddle [informal], nasty, noncompliant, pickle [informal], problematic, problematical, rocky, rough, rugged, serious, sticky, tall, thorny, ticklish, tickly, tight, touchy, tough, tricky, troublesome, trying, uncheckable, uncontrollable, unenviable, ungovernable, unruly, vexed

Antonym: easy, manageable

Encyclopedia: Difficult