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The root word is the Greek word theos (god), which became the noun enthusiasm and the adjective enthusiastic(entheos, "having a god within"). The formation of the shorter verb form "to enthuse" is a 19th Century Americanism.

The word uses the adjective form of enthusiasm -asticconnected by al to the adverb suffix -ly (in that manner), and the negative prefix un- (not).

Un-enthusiastic-al-ly : in a manner which suggests the person is not acting with enthusiasm, half-heartedly.

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15y ago

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