only 1 use
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- Frodo and Sam, horror-stricken, began slowly to back away, their own gaze held by the dreadful stare of those baleful eyes; but as they backed so the eyes advanced.4.9 -- Book 4 Chapter 9 -- Shelob's Lair (39% in)
There are no more uses of "baleful" in The Two Towers.
Typical Usage (best examples)