frowninggerund / present participle Explicitly marks the participial adjective use of "frowning".
Definitions
Showing or marked by the action of pulling the eyebrows together in displeasure, worry, or concentration. The frowning guards stood silently at the palace gates.
frowngerund / present participle Used to modify nouns, describing someone or something that is currently frowning.
Definitions
Displaying a frown; scowling. The frowning statue looked ominous in the twilight.