Meanings of sudden enthusiasms in English

He'd be swept away by sudden enthusiasms.

On the other hand, he was a creature of sudden enthusiasms and had already undergone one unanticipated conversion.

Joe was prone to sudden enthusiasms, but what he had found was enough to justify any amount of excitement.

Unaccustomed as Val was to sudden enthusiasms, he found himself liking René LeFleur almost before his hand gripped Val's.

I would have, like other girls, sudden enthusiasms for some one who seemed strong and wonderful-andthen they were never wonderful-onlylike every one else.