stock-still
     adj : absolutely still; "frozen with horror"; "they stood rooted
           in astonishment" [syn: {frozen(p)}, {rooted(p)}]
     adv : without moving or making a sound; "he sat still as a
           statue"; "time stood still"; "they waited stock-still
           outside the door"; "he couldn't hold still any longer"
           [syn: {still}]
Source: WordNet® 2.0