requiring much effort, strength, skill or ability
hard on someone; hard to do
Cases of word usage
1) the soft growth between the back of the nose and the throat, sometimes making breathing difficult (adenoids)
2) talk that is difficult to understand (e.g. of a baby, people at a party) (babble)
3) to be too difficult for (a person) to do, understand etc (baffle)
4) making seeing difficult because very bright (blinding)
5) a view, site, image, that is unclear and difficult to identify (blur)
6) (to give something) a colour, pattern, shape etc that makes it difficult to identify (camouflage)
7) (of a person) careful and choosing (and so difficult to please) (choosy)
8) made up of many connected parts (and often difficult to understand or explain) (complex)
9) to make (something) difficult to do or understand (complicate)
10) difficult or infrequent emptying of the bowels (constipation)