chicken
chickenhearted
lily-livered
white-livered
yellow
yellow-bellied
easily frightened
turn yellow
The pages of the book began to yellow
yellowish
xanthous
of the color intermediate between green and orange in the color spectrum; of something resembling the color of an egg yolk
jaundiced
icteric
affected by jaundice which causes yellowing of skin etc
cowardly or treacherous
the little yellow stain of treason
M.W.Straight
too yellow to stand and fight
yellowed
changed to a yellowish color by age
yellowed parchment
scandalmongering
sensationalistic
typical of tabloids
sensational journalistic reportage of the scandal
yellow press
yellowness
yellow color or pigment; the chromatic color resembling the hue of sunflowers or ripe lemons