strong

• Russian
  си́льныйsilʹnyj

  ˈsʲilʲnɨjinherited
• Ukrainian
  си́льнийsylʹnyj

  ˈsɪlʲnɪjinherited
• Polish
  silny

  ˈɕilnɨinherited
• Czech
  silný

  ˈsɪlniːinherited
• Bosnian-Croatian-Serbian
  snažanснажан

  ˈsnaʒandifferent word · Proto-Slavic *snaga 'strength'

  Jak is just as common; silan means 'mighty, tremendous'.

• English
  strong

Sound laws at work

• The fall of the yers