The Catechism makes it clear that we should speak the truth at all times and not use our words to injure another.

2479   Detraction and calumny destroy the reputation and honor of one's neighbor. Honor is the social witness given to human dignity, and everyone enjoys a natural right to the honor of his name and reputation and to respect. Thus, detraction and calumny offend against the virtues of justice and charity.

2480   Every word or attitude is forbidden which by flattery, adulation, or complaisance encourages and confirms another in malicious acts and perverse conduct. Adulation is a grave fault if it makes one an accomplice in another's vices or grave sins. Neither the desire to be of service nor friendship justifies duplicitous speech. Adulation is a venial sin when it only seeks to be agreeable, to avoid evil, to meet a need, or to obtain legitimate advantages.

2481   Boasting or bragging is an offense against truth. So is irony aimed at disparaging someone by maliciously caricaturing some aspect of his behavior.

2482   "A lie consists in speaking a falsehood with the intention of deceiving." The Lord denounces lying as the work of the devil: "You are of your father the devil, . . . there is no truth in him. When he lies, he speaks according to his own nature, for he is a liar and the father of lies.

Catechism of the Catholic Church

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