"icy smile" is correct and usable in written English.
It can be used to describe someone's facial expression as cold, distant, or unfriendly. It could also be used to convey a sense of maliciousness or calculated intent behind a smile. Example: Despite her polite greeting, her eyes held an icy smile that sent shivers down my spine.
"You should stop enticing away the Bolshoi's dancers," Putin said with an icy smile.
Ponting later produced an icy smile and said: "That was Test cricket, it was Ashes cricket, it is what it is all about.
With his square-jawed, no-hair-out-of-place looks and icy smile, he often resembles an animatronic version of a chief justice, with the dial set firmly to the right.
In his previous court appearance in February, Zaidi, draped in an Iraqi flag, told the court how his anger had boiled over as he watched Bush "smiling that icy smile" while standing next to Maliki.
Sophie froze with an icy smile.
With an icy smile, the 34-year-old Grimes scoffed at the notion that she was philosophically or politically close to President Barack Obama, who is so unpopular here that he is mentioned by Kentucky Democrats fewer times than Voldemort ever was at Hogwarts.
God help you to try and thaw their icy smiles if you respond with "artist".
Lulu herself, murderous, man-eating and "the root of all evil" in the decidedly unliberated view of her young creator, the playwright Wedekind, was sung with bristling, vocal athleticism by Agneta Eichenholz, an ironic, icy half-smile constantly playing on her stunning, porcelain features.
Nearly all of the Safe Passage guards are middle-aged African-American women, and they nearly all recognize us and wave and smile, braving icy temperatures for hours every winter morning and afternoon.
The face -- thin, almost fragile, silver hair, icy eyes, a half-smile -- was familiar in Buenos Aires, in Barcelona, in Mexico City.
When Murray won, as bedlam broke out around him, Lendl hardly cracked a smile, his demeanor icy until the end.
