alert and vigilant

Having a sad facial expression.

Not having shed tears. / (by extension) Not made sad (by something); emotionally unaffected.

Having eyes that reflect happiness.

Used other than figuratively or idiomatically: see red, eyed. / Having the eyelids reddened, e.g. by tears or lack of sleep.

Having tears in one's eyes, as if from crying.

(of a person) Having frog-like, bulging eyes. / (of tobacco used for cigar wrappers) Spotted with whitish specks due to a disease, or produced artificially by spraying.

Having small, bright eyes. / Giving a suspicious and alert look.

Having sunken, dark ringed eyes demonstrative of fear or lack of sleep.

plural of four-eyed fish