The phrase "feeble light" refers to a dim or weak source of illumination. Synonyms for this term might include "dim glow," "faint beam," "pale illumination," or "soft radiance." Other options might include "low brightness," "subdued shine," or "gloomy glimmer." These choices all convey a sense of light that is not very powerful or bright, but that does provide some degree of illumination. Depending on the context in which the phrase is being used, other synonyms might be more appropriate; for example, "dim flicker" might be suitable for a candle flame, while "hazy shimmer" could describe a distant streetlamp.