A Catholic who is scrupulous is usually very meticulous in the practices of religion and faith. So, for instance, someone who spends an hour or more examining his conscience before Confession might be scrupulous.
Someone who is overly scrupulous, for example, would begin to worry immediately after Confession that he forgot to confess a sin from a few months ago and will not rest until he goes to confession again, perhaps even in the same day to confess some forgotten sin.
So it is good to be scrupulous to a certain degree unless it begins to turn into a kind of compulsion.
Those who have questions about cases of possible sin where there are involved theological principles involved, are not scrupulous. They are just trying to find the truth. Laxists who tell them they are scrupulous for this have merely imbided the spirit of the world. It is best for such persons to find a learned and pious spiritual director in order to free themselves from any scruples of conscience they may have and in order to be guided to the truth and to the proper principles needed to assess moral action. I highly recommend FSSP priests in general for this, though if you send me a private message, I could perhaps provide you more details, depending where you are living.
A Catholic who is scrupulous is usually very meticulous in the practices of religion and faith. So, for instance, someone who spends an hour or more examining his conscience before Confession might be scrupulous.
St. Francis de Sales recommends a 15-minute examination for someone who goes to confession each week (with an equal amount of time to evoke contrition). He says that those who go longer between confessions would need to make appropriately longer examinations. If someone only goes a few times a year, an hour may not even be enough.
So it is good to be scrupulous to a certain degree unless it begins to turn into a kind of compulsion.
I recommend the article I posted below for the distinction between a delicate and scrupulous conscience.
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