Definition

1. Noun:
   • A state of inactivity and lack of energy: A condition characterized by a deficiency in physical or mental vigor.
   • A reduction or lack of an immune response to a specific antigen: In immunology, a state in which the immune system fails to mount a response against a particular substance.

Usage Examples

• Noun (Lack of Energy):
  • After the long illness, she was overcome by a profound anergy.
  • The patient's symptoms included severe depression and anergy.
• Noun (Immunological):
  • The vaccine aims to induce anergy in the T-cells specific to the allergen.
  • Anergy to self-antigens is a crucial mechanism for preventing autoimmune diseases.

Advanced Usage

• Induced anergy: A state of immune unresponsiveness that is deliberately caused, often in therapeutic contexts.
  • Researchers are studying induced anergy as a potential treatment for allergies.
• Clonal anergy: A technical term for the functional inactivation of specific lymphocytes (like T-cells or B-cells).
  • Clonal anergy ensures that immune cells reacting to the body's own tissues are rendered harmless.

Variants and Related Words

• Anergic (Adjective): Pertaining to or characterized by anergy.
  • The patient was anergic and showed no reaction to the skin test.

Synonyms

• Lethargy: A lack of energy and enthusiasm.
• Lassitude: A state of physical or mental weariness.
• Unresponsiveness: A lack of reaction, especially in an immunological context.
• Tolerance: In immunology, a state of non-reactivity to an antigen.

Notes on Different Meanings

• The first meaning (inactivity, lack of energy) is primarily used in medical and psychological contexts to describe a patient's condition.
• The second meaning (immunological unresponsiveness) is a specialized term used in immunology and medical research. These two meanings are distinct and context-dependent.

Noun

1. inactivity and lack of energy
2. reduction or lack of an immune response to a specific antigen