Antonyms of adv indoors

1 sense of indoors

Sense 1
inside, indoors -- (within a building; "in winter we play inside")
       Antonym of outdoors (Sense 1)
      => outside, outdoors, out of doors, alfresco -- (outside a building; "in summer we play outside")

Synonyms of adv indoors

1 sense of indoors

Sense 1
inside, indoors -- (within a building; "in winter we play inside")