1) At home 2) Inside 3) Like games in the dome 4) Not al fresco 5) Not alfresco 6) Not outside 7) Out of the elements 8) Place to go when it rains 9) Place to stay on a rainy day 10) Suffering from cabin fever 11) Where to see some squash 12) Where to stay on a rainy day 13) Within a building 14) Within building 
• (adv.) Within the house; -- usually separated, in doors.
In'doors` adverb Within the house; -- usually separated, in doors . 
in or into a house or building: We stayed indoors during the storm.