... Raoul, indignant, turned round frowningly, flushed with anger and his lip curling with disdain... 
Alexandre Dumas, Pere 「Ten Years Later」
...Abdul Mourak eyed him, frowningly...
Edgar Rice Burroughs 「Tarzan and the Jewels of Opar」
...Above, the rock rose frowningly, at least five hundred feet over our heads...
Horatio Bridge 「Journal of an African Cruiser」
..."Nay, lad," hecried, frowningly...
Abbie Farwell Brown 「The Curious Book of Birds」
...Potan looked frowningly around...
Various 「Astounding Stories of Super-Science, May, 1930」
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