If our soldiers are not overburdened with money it is not because they have a distaste for riches if their lives are not unduly long it is not because they are disinclined to longevity.

Jealous adj. Unduly concerned about the preservation of that which can be lost only if not worth keeping.

Let us eat and drink neither forgetting death unduly nor remembering it. The Lord hath mercy on whom he will have mercy etc. and the less we think about it the better.

At the root of the shy temperament is a deep fear of social judgment one so severe it can sometimes be crippling. Introverted people don't worry unduly about whether they'll be found wanting they just find too much socializing exhausting and would prefer either to be alone or in the company of a select few people.