Related Clues:

• Hard to pick up
• Oppressively heavy
• Intransigent
• Plodding
• Oppressively sluggish
• Listless
• Extremely obstinate
• Unwilling to budge
• Like a winter sky
• Pigheaded
• Lacking lightness
• Like the winter sky, often
• Like winter skies
• Leaned over in slow, heavy way
• Describes grey overcast skies