difficult
Cross references:
1. hard
dif.fi.cult \'dif-i-(.)k*lt\ aj [back-formation fr. difficulty] 1: hard to
do, make, or carry out : ARDUOUS {a ~ climb} 2a: hard to deal with,
manage, or overcome {a ~ child} 2b: hard to understand : PUZZLING {~
reading} - dif.fi.cult.ly av
Webster's English Dictionary