adj

• (obsolete) Terrifying
  "And much dismay'd with that dismayful Sight, That back she would have turn'd for great Affright"
• (obsolete) Dismaying; disheartening.
  "The most unvaluable and dismayful loss of my most dear and heroical Patron, Prince Henry, hath so stricken all my spirits to the earth, that I will never more dare to look up to any greatness; but resolving the little rest of my poor life to obscurity, and the shadow of his death, prepare ever heareafter for the light of Heaven."
• (obsolete) Dismayed; full of disappointment or low spirits.
  "But as the signs that day were different from what they had been at any former time when this adventure had been essayed, the city itself was overspread with so thick and black a cloud, and filled with sounds so dolorous and dismayful, that no one had either judgment so free, or heart so strong, as to be exempt from the fear which these terrors occasioned."