Of a feeling, etc.: Exuberant outburst; exuberance. Now rare. In early use: †Overblown pride; swagger.

Excrescent state or condition; the quality or fact of growing out or forth; abnormal or excessive development; an instance of the same. †In early use…

The quality of being ebullient: readiness to boil or bubble forth or overflow. literal and figurative.

An issuing forth in agitation, like boiling water; overflow; enthusiasm, extravagance.

An extravagance, excessive outburst.

concrete. An ‘outburst’ of high spirits. rare.