funct-, fungi- (Latin: to perform, execute, discharge; performance, service, execution).defunct: 
1. No longer in existence; having ceased its functions; dead, extinct.  
2. No longer operative, valid, or functional. defunctive: 
Of or pertaining to defunction or dying. Also, becoming defunct; dying.
 
dysfunction: 
A medical abnormality in the functioning of an organ or other part or system of the body.
 
dysfunctional: 
1. Failing to perform the function that is normally expected.  
2. Unable to function emotionally as a social unit. 3. In medicine, unable to function normally as a result of disease or impairment. function: 
1. An action or use for which something is suited or designed.  
2. An activity or role assigned to someone or something. 3. A social gathering or ceremony, especially a formal or official occasion. 4. A quality or characteristic that depends upon and varies with another. functional: 
1. Having a practical application or serving a useful purpose.  
2. In good working order or working at the moment. 3. Without apparent organic or structural cause. functional illiterate: 
Someone whose reading and writing abilities are inadequately developed to meet everyday needs.
 
functionalism: 
1. Belief that the intended function of something should determine its design, construction, and choice of materials, or a 20th-century design movement based on this.  
2. Any philosophy or system that gives practical and utilitarian concerns priority over esthetic concerns. functional literacy: 
The level of skill in reading and writing that an individual needs to cope with everyday adult life.
 
functionary: 
Someone who performs official duties; especially, a person whose duties are regarded as trivial. 
 
functor: 
Someone or something that performs a function.
 
fungible: 
1. Capable of being interchanged.  
2. A description of commodities that can be traded or substituted for an equal amount of like commodity, usually to satisfy a contract. hyperfunction, hyperfunctional: 
In medicine, over-activity or over-production (in a gland or other part of the body).
 
hypofunction, hypofunctional: 
In medicine, diminished or insufficient activity or production (in a gland or other part of the body).
 
malfunction, malfunctioning: 
Faulty functioning.
 
multifunction, multifunctional: 
Having or fulfilling many functions.
 
perfunctory, perfunctorily, perfunctoriness: 
1. Done as a matter of duty or custom, without thought, attention, or genuine feeling.  
2. Done hastily or superficially. underfunction: 
Primarily in medicine, to exhibit underfunction; to have a diminished capacity for acting and responding.
 
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