verb (used without object), en·thused, en·thus·ing.

  1. to be or become enthusiastic; show enthusiasm: All the neighbors enthused over the new baby.

verb (used with object), en·thused, en·thus·ing.

  1. to cause to become enthusiastic.


  1. to feel or show or cause to feel or show enthusiasm

v.1827, American English, back-formation from enthusiasm. Originally often humorous or with affected ignorance. Related: enthused; enthusing.

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