艰 (w)

(jiān) difficult; hard; hardship

艰巨 (w)

(jiānjù) arduous; terrible (task); very difficult; formidable

艰巨性 (w)

(jiānjùxìng) arduousness; formidability; difficulty

艰深 (w)

(jiānshēn) abstruse; complicated

艰深晦涩 (w)

(jiānshēnhuìsè) abstruse and unfathomable (idiom)

艰苦 (w)

(jiānkǔ) difficult; hard; arduous

艰辛 (w)

(jiānxīn) hardships; arduous; difficult

艰险 (w)

(jiānxiǎn) difficult and dangerous; hardships and perils

艰难 (w)

(jiānnán) difficult; hard; challenging

艰难险阻 (w)

(jiānnánxiǎnzǔ) untold dangers and difficulties (idiom)