艱〔艰〕 gaan¹ {jiān}

1. difficult
2. hard
3. hardship

艱苦〔艰-〕 gaan¹ fu² {jiān kǔ}

1. difficult
2. hard
3. arduous

艱巨〔艰-〕 gaan¹ geoi⁶ {jiān jù}

1. arduous
2. terrible (task)
3. very difficult
4. formidable

艱險〔艰险〕 gaan¹ him² {jiān xiǎn}

1. difficult and dangerous
2. hardships and perils

艱難〔艰难〕 gaan¹ naan⁴ {jiān nán}

1. difficult
2. hard
3. challenging

艱深〔艰-〕 gaan¹ sam¹ {jiān shēn}

1. abstruse
2. complicated

艱辛〔艰-〕 gaan¹ san¹ {jiān xīn}

1. hardships
2. arduous
3. difficult

艱巨性〔艰--〕 gaan¹ geoi⁶ sing³ {jiān jù xìng}

1. arduousness
2. formidability
3. difficulty

艱苦奮鬥〔艰-奋斗〕 gaan¹ fu² fan⁵ dau³ {jiān kǔ fèn dòu}

to struggle arduously

艱苦樸素〔艰-朴-〕 gaan¹ fu² pok³ sou³ {jiān kǔ pǔ sù}

leading a plain, hardworking life (idiom)

艱難險阻〔艰难险-〕 gaan¹ naan⁴ him² zo² {jiān nán xiǎn zǔ}

untold dangers and difficulties (idiom)

艱深晦澀〔艰--涩〕 gaan¹ sam¹ fui³ gip³ {jiān shēn huì sè}

abstruse and unfathomable (idiom)