Compounds of 硬い

• 硬い
  (adj-i) (1) hard
  solid
  tough
  (2) stiff
  tight
  wooden
  unpolished (e.g. writing)
  (3) strong
  firm (not viscous or easily moved)
  (4) safe
  steady
  honest
  steadfast
  (5) obstinate
  stubborn
  (6) bookish
  formal
  stuffy
  (P)
• 硬い石
  (n) hard stone
• 硬い表情
  (n) stiff expression
• 硬い文章
  (n) stiff style
• 硬いことは言いっこなし
  (exp) let's put formalities aside
  let's not speak so stiffly