Answer:
In the definition of "cloud, gloom", synonyms for pall could be: cloak, cloth, damp, damper, dismay, mantle, melancholy, shadow, shroud, veil
In the definition of "bore, tire", synonyms for pall could be: become dull, become tedious, cloy, disgust, fill, glut, gorge, jade, state, satiate, sicken, surfeit, weary