Meaning:
* Sharp: This is the original meaning, referring to a physical sharpness, like a knife's edge. This sense is still used, especially in phrases like "keen as a tack" or "keen eyesight."
* Eager, enthusiastic, or interested: This is the most common meaning today. It describes someone who is excited and motivated, like "keen on learning" or "keen to go."
* Strong or intense: This meaning is less common but still used in some contexts, such as "keen pain" or "keen competition."
Language:
The word "keen" comes from Old English (c. 450-1150 AD), where it was spelled "cēne" and meant "bold, brave, spirited." It was a strong word with a positive connotation, implying strength, courage, and even a bit of ferocity.
Evolution:
Over time, the word's meaning shifted, losing some of its original fierceness and taking on the sense of eagerness and sharpness that we associate with it today. It is related to words like "kind" and "kin," which also derive from Old English.
So, in short, "keen" is a word with a long and interesting history, starting with a strong sense of courage and now mostly associated with enthusiasm and intensity.