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keen adj., sharp, intense. When the pain from the bee sting began to grow keener, I decided to try coating it with mud. keener, adj.

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sel • dom adv., rarely, infrequently. They seldom go to the movies, but this film is one that must be seen on the
big screen.

trill n., trembling, vibrating sound. The whistle gave out a high-pitched trill that made my dog stop and raise his ears.