Silent

adjective
1.
making no sound; quiet; still:
a silent motor.
2.
refraining from speech.
3.
speechless; mute.
4.
not inclined to speak; taciturn; reticent.
5.
characterized by absence of speech or sound:
a silent prayer.
6.
unspoken; tacit:
a silent assent.
7.
omitting mention of something, as in a narrative:
The records are silent about this crime.
8.
inactive or quiescent, as a volcano.
9.
not sounded or pronounced:
The “b” in “doubt” is a silent letter.
10.
Movies. not having spoken dialogue or a soundtrack.
11.
Medicine/Medical. producing no symptoms:
silent gallstones.
noun
12.
Usually, silents. silent films.
adjective
1.
characterized by an absence or near absence of noise or sound: a silent house
2.
tending to speak very little or not at all
3.
unable to speak
4.
failing to speak, communicate, etc, when expected: the witness chose to remain silent
5.
not spoken or expressed: silent assent
6.
not active or in operation: a silent volcano
7.
(of a letter) used in the conventional orthography of a word but no longer pronounced in that word: the “k” in “know” is silent
8.
denoting a film that has no accompanying soundtrack, esp one made before 1927, when such soundtracks were developed
noun
9.
a silent film

silent si·lent (sī’lənt)
adj.
Producing no detectable signs or symptoms. Used of certain diseases or pathological processes.
silent
(sī’lənt)

Relating to a mutation that changes a nucleotide in a codon without a difference in the amino acid for which it is coded. See more at point mutation.

Producing no detectable signs or symptoms, as a medical condition such as heart attack.