食不知味

lit. to eat without tasting the food / worried or downhearted (idiom)

no; not so / (bound form) not; un-

to know / to be aware

not to know / unaware / unknowingly / fig. not to admit (defeat, hardships, tiredness etc)

taste / smell / (fig.) (noun suffix) feel / quality / sense / (TCM) classifier for ingredients of a medicine prescription

to eat / food / animal feed / eclipse

to feed (a person or animal)