Tiggerish

In the crucial scene of third-degree examination the wife of the accused turns on the magistrate and berates him with tiggerish ferocity and later stabs him to his death by way of reprisal.

Source: wiktionary

And still there is about him a hint of the ingenu; a Tiggerish quality of enthusiasm for the [Tony] Blair vision that has nothing to do with fawning loyalism.

Source: wiktionary

If you want to kill inertia and overcome the hard part of starting up, in your own way you've got to develop Tiggerish characteristics. You need a relentless, boundless optimistic enthusiasm for what can be achieved although it is yet to happen […]

Source: wiktionary

Everyone likes Sam – often despite themselves – because he makes them feel likeable, because they want him to like them back, because he exudes such a Tiggerish enthusiasm for life. Quite simply, he makes life more interesting.

Source: wiktionary