Lack
Scarcity, Deficiency
We are lacking and things are scarce. We have a lack and scarcity of resources.
けつぼう
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
ビタミンDが欠乏しているかどうかはどうすれば分かりますか。
How can I know if I’m deficient in Vitamin D?