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Definition of keenly : In a keen manner.

Synonyms:

eagerly, avidly, piercingly, perceptively, cleverly, astutely, vigorously, penetratingly, vividly, with acumen, with perception, with precision, distinctly, on the ball, intently, alertly, very

curtly, briskly, gruffly, coolly, dryly, intensely, oppressively, ascetically, bleakly, rigorously, precisely, correctly, acrimoniously, leanly, matter-of-factly, strictly, abruptly, harshly, icily, frostily, critically, exactingly, brusquely, demandingly, crisply, bluntly, intolerantly, piquantly, severely, starkly, imperially, tartly, grimly, sternly, shortly, sharply, acutely, meticulously, sparely, rawly, acerbically, basically, cuttingly, fundamentally, austerely, stringently, dourly, caustically

pointedly, jaggedly, spikily

Usage examples:

• She listened keenly to each word. - "Nan of Music Mountain", Frank H. Spearman.
• He nodded, watching her keenly, holding back his answers for just a second or two each time. - "The Bells of San Juan", Jackson Gregory.
• It was evident, however, that I could not do this if I were with you, since he would be keenly on his guard. - "The Hound of the Baskervilles", A. Conan Doyle.