The phrase "as faint" is correct and usable in written English.
It can be used to describe something that is weak, dim, or not easily perceived, often in comparison to something else.
Example: "The sound of the music was as faint as a whisper in the night."
Alternatives: "as weak" or "as dim."
That shouldn't be taken as faint praise.
Does that count as faint praise?
It comes as faint praise from Scott's cutthroat brethren.
I've nothing against that," said David Attenborough, which is about as faint as praise gets.
This may be regarded as faint praise in New York, capital of Type A personalities.
Observed from Earth-bound observatories, the moons appear as faint dots of light moving around the planet.
During his debut, he hid his grin as faint chants of "We want Rooney!" broke out on several occasions.
The line between cops and criminals is almost as faint, and eventually that attracts the attention of Internal Affairs.
However, they were detected as faint diffuse density distal to the Dl tier in a difference image between wild-type ClpAP and a mutant lacking the N-domain.
It will execute observations of astronomical objects with a sensitivity for point sources as faint as 1/100,000 of the Crab nebula at >10keV.
The two Magellanic Clouds are visible to the left of the beam as faint, fuzzy patches against the starry background.
