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Serious means mortal/grave (they are synonyms in Moral Theology/Ecclesiastical usage)Moreover, “serious” is not merely a binary term. Although it can be used in such a manner, it can also be used as a gradation, as the Church implicitly understands by talking of “less serious” sins.
Interestingly, the quotes you provide generally focus on the terms “mortal” and “grave”, especially in the catechism. If we look at the relevant section in the catechism, we see these two terms used liberally, but not the term serious, expect, again, in a different sense:
“1862 One commits venial sin when, in a less serious matter, he does not observe the standard prescribed by the moral law, or when he disobeys the moral law in a grave matter, but without full knowledge or without complete consent.”
Perhaps the issued associated with defining a word like “serious”, which has a common use meaning otherwise, is why the catechism does not use it, but prefers the more precise terms mortal and grave.
Less serious there refers to venial matter.
As for Catechism usage --(and by the way use it interchangably with mortal sin):
1457 According to the Church’s command, “after having attained the age of discretion, each of the faithful is bound by an obligation faithfully to confess serious sins at least once a year.” Anyone who is aware of having committed a mortal sin must not receive Holy Communion, even if he experiences deep contrition, without having first received sacramental absolution, unless he has a grave reason for receiving Communion and there is no possibility of going to confession. Children must go to the sacrament of Penance before receiving Holy Communion for the first time.
and here is the
The Compendium of the Catechism issued by Pope Benedict XVI usage for the same thing.
"304. Which sins must be confessed?
1456
All **grave sins **not yet confessed, which a careful examination of conscience brings to mind, must be brought to the sacrament of Penance. The confession of serious sins is the only ordinary way to obtain forgiveness."