reduction or lack of an immune response to a specific antigen
<noun.state>
inactivity and lack of energy
<noun.state>
Anergia \An*er"gi*a\, Anergy \An"er*gy\, n. [NL. anergia, fr. Gr. ?- not + ? work.] Lack of energy; inactivity. -- {An*er"gic}, a. [Webster 1913 Suppl.]