Anemic

I'm anemic.

Yanni is anemic.

Tom is anemic.

Near-synonyms: enervated, underoxygenated

[H]e was one of those weak creatures full of a shifty cunning - who face neither God nor man, who face not even themselves, void of pride, timorous, anæmic, hateful souls.

My ordinarily even disposition was shattered, I thought, beyond repair — a condition that was not improved by my utter abhorrence of a diet of infant's food and anemic vegetables.