The NeoQuenya and NeoSindarin Wiktionary
kneed, soften
meidhia-
Based on the ancient root (MASAG) and madhias 'dough, softness, pliancy' (VT45:32).
tarias 'stiffness' (Ety390)
thalion 'dauntless man' (Ety388, S438)
Roman Rausch (here)