Examples: he argued with great acuteness I admired the keenness of his mind
keenness (English)├── -ness (English)└── keen (English) ├── caoin (Irish) │ ├── caín (Old Irish (to 900)) │ └── caínid (Old Irish (to 900)) └── kene (Middle English (1100-1500)) └── cene (Old English (ca. 450-1100))
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