Throughout “Martha,” Stewart colors her words with effervescent agreeability, only to betray flashes of discomfort when the silence stretches beyond a second or two.

He laughs again, an effervescent sound bubbling from deep inside him.

A year ago here in Liverpool, the mood at Labour’s conference was effervescent, “there was energy, buzz and anticipation,” as one minister put it.

While the typical person observes Harris’ effervescent guffaw, and thinks, “She seems fun!”

At the end of May, the Perelman Arts Center posted a clip on social media of “Jellicle Cats,” the catchy, effervescent opening number from the musical “Cats.”