1257110 jmdict A [id=1950457]
硬い[ichi1,news2,nf33]；固い[ichi1,news2,nf46]；堅い[ichi1,news2,nf29]；緊い[iK]
かたい[ichi1,news2,nf29,nf33,nf46]
[1][adj-i]
  [note="esp. 固い and 堅い for wood, 硬い for metal and stone"]
  hard; solid; tough
[2][adj-i]
  stiff; tight; wooden; unpolished (e.g. writing)
[3][adj-i]
  strong; firm (not viscous or easily moved)
[4][adj-i]
  safe; steady; honest; steadfast
[5][adj-i]
  obstinate; stubborn
[6][adj-i]
  bookish; formal; stuffy
  [ant=2130700・砕けた[1,2]]