The Oxford Thesaurus An A-Z Dictionary of Synonyms - sky n.

1) heaven(s) , skies, arch or vault of heaven, firmament, (wild) blue (yonder) , ether, Archaic or literary welkin, empyrean, azure: The dour, overcast sky gave the bleak moor a chilling sense of foreboding. 2) to the skies. overly, excessively, extravagantly, fulsomely, profusely, inordinately, highly: If I praise him to the skies people will get the idea that I benefit from his success.