As a verb fester
is to become septic; to become rotten.
As an adjective infectious is
(pathology|of an illness) transmitted from one person to another, usually through the air breathed.
To become septic; to become rotten.
To worsen, especially due to lack of attention.
- Wounds immedicable / Rankle, and fester , and gangrene.
- Deal with the problem immediately; do not let it fester .
To cause to fester or rankle.
- Hatred festered in the hearts of the children of the soil.
- For which I burnt in inward, swelt'ring hate, / And fester'd rankling malice in my breast.
(pathology, of an illness) Transmitted from one person to another, usually through the air breathed.
- Cancer is not infectious .
(pathology, of a person) Able to infect others.
- More infectious diseases like the flu are usually less potent.
(of feelings and behaviour) Spreading quickly from one person to another.
- Despite feeling better, the patient is still infectious .
(informal) Memorable and invoking excitement or interest.
- Her enthusiasm for work can be really infectious .
- Pop music is more infectious than elevator music.
* (transmitted between persons as illness) catching, contagious
* (able to infect others) contagious
* (spreading quickly between persons) contagious
* (memorable and exciting) catchy, contagious