voiceless

Misollar

Dutch has both voiced and voiceless consonants.
Voiceless plosives in Dutch have almost no aspiration at all.
In that language, voiceless consonants tend to be voiced intervocalically.
It seems appropriate to apply these rules to the voiceless consonants.
Through determination and perseverance, he's become a voice for the voiceless.

sifat adjective

Lacking a voice, without vocal sound.
Without a vote; having no input into a decision.
(of a consonant) Spoken without vibration of the vocal cords; unvoiced, surd. Examples: [t], [s], [f].

Manbalar: Wiktionary (Free Dictionary API orqali), Datamuse, Tatoeba (CC BY 2.0 FR), MyMemory.