Comparative form of bosky; more wooded, more thickly covered with bushes and trees, or more densely vegetated.
From 'bosky' (adjective meaning wooded) plus the comparative suffix '-er,' following regular English adjective comparison patterns.
The comparative 'boskier' rarely appears in modern English, but it shows how older poetic vocabulary had rich gradations—writers could describe a forest becoming progressively more wild and thickly overgrown.
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