Encara no tenim significats per a "tuneless whistling".
1Ignatius chewed while the man began his tuneless whistling again.
2Now this soft, almost tuneless whistling, was to Mr. Gibson what purring is to a cat.
3The tuneless whistling went on.
4And the lonely tuneless whistling of a blustery winter storm playing rain gutters and downspouts as though they were icy flutes.
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