au grand sérieux /ō grã sā-ryøˈ/ (French; now très au sérieux /tre-zō/) in all seriousness.

• stone cell
• stone cells
• stonechat
• stonechats
• stone circle
• stone circles
• stone coal
• stone coals
• stone-cold
• stone-cold sober
• stone-colour
• stone-coloured
• stone-colours
• stone crab
• stone crabs
• stone-crazy
• stonecrop
• stonecrops
• stone curlew
• stone curlews
• stonecutter
• stonecutters
• stonecutting
• stonecuttings
• stoned