Word: demotivate
Part of speech: Verb
Syllables: de
mo
ti
vate
Definition: To decrease the motivation of a person or a group.
Morphemes:
Affix: de-
Language: en
PoS: Prefix
Meaning: Intensifying; make more intense, stronger, or more marked; 
Etymology Compounds: Affix: dē-
Language: la
Decoded: de-
PoS: Prefix
Meaning: de-
Affix: motive
Language: en
PoS: Noun
Meaning: An incentive to act in a particular way; a reason or emotion that makes one want to do something; anything that prompts a choice of action.
Etymology Compounds: Affix: motivum
Language: LL.
Decoded: motivum
Meaning: motive, moving cause
Affix: -ate
Language: en
PoS: Suffix
Meaning: to act in the specified manner