WordNet sense 1 (a wooden strip forming part of a fence):

picket

WordNet sense 2 ((of light) lacking in intensity or brightness; dim or feeble):

pallid, sick, wan

WordNet sense 3 (having little physical or spiritual strength):

weak

WordNet sense 4 ((of sound) lacking resonance or volume):

thin

WordNet sense 5 ((used of color) having a relatively small amount of coloring agent):

light, light-colored

WordNet sense 6 (lacking in variety and interest):

colorless, colourless

WordNet sense 7 (turn pale, as if in fear):

blanch, blench