Related Clues:

• Subdued; not bright
• Subdued, as colors
• Enlist (anag) — mum
• Not loud
• Keeping mum and boy in squat
• Like the letters omitted from the starred answers (collected here)
• Like most Chaplin films
• Need to sleep, maybe
• Like some initial P's
• Muffled, as a trumpet
• Like the last letter in a column?
• Still at a loss for words
• Like the first 'd' in 'Wednesday'
• Bryan Adams "I was caught in the crossfire of a ___ scream"
• Deftones "Be ___ and Drive (Far Away)"