surd

Adjective

• produced without vibration of the vocal cords
  • unvoiced consonants such as `p' and `k' and `s'
    

Noun

• a consonant produced without sound from the vocal cords

Related words

• Synonyms: 
  unvoiced , voiceless , hard , voiceless consonant
• Antonyms: 
  voiced , sonant , soft