shortage, lack, insufficiency, moderation, deficiency, dearth

deficiency, lack, insufficiency, need, dearth

On its own, pulmonary valve insufficiency is seldom severe enough to require treatment.

Overabundance Contamination Deformity or Insufficiency I dont know!

To never lack is to never have an insufficiency or loss of something. And the opposites (the antonym) of insufficiency are abundance, excess, surplus, extra, plenty, and having enough.

And in simpler words, to never lack is to never lose. And the opposite of losing is gaining.

I didn't want to confuse you. (: