The Collaborative International Dictionary of English v.0.48:
Lion-hearted \Li"on-heart`ed\ (l[imac]"[u^]n*h[aum]rt`[e^]d), a. Very brave; brave and magnanimous. --Sir W. Scott. [1913 Webster]WordNet (r) 3.0 (2006):
lionhearted adj 1: extraordinarily courageous