1. Without speaking
   - mutely, wordlessly, taciturnly 
2. Without a sound
   - noiselessly, soundlessly

See also: silent

• metatarsal vein
• metatarsus
• Metatheria
• metatherian
• metathesis
• metathetical
• Metaurus River
• Metazoa
• metazoan
• Metchnikoff
• Metchnikov
• mete
• mete out
• meted out
• metempsychosis
• metencephalon
• meteor
• meteor shower
• meteor stream
• meteor swarm
• meteoric
• meteorite
• meteoritic
• meteoritical
• meteoroid