1. in a manner that shows excessive or affected devotion to religious practices or moral principles
Usage: often carries a critical or disapproving tone; suggests insincerity or self-righteousness

Examples

• He spoke pietistically about charity while refusing to help his neighbors.
• The politician pietistically invoked religious values during the campaign.
• She pietistically condemned others for minor moral lapses.
• They behaved pietistically in public but lived quite differently in private.
• The sermon was delivered pietistically, more concerned with appearance than substance.