1. Without pity; in a merciless manner
   - mercilessly, pitilessly, unmercifully

See also: remorseless

• family Pelecanidae
• family Pelecanoididae
• family Pelobatidae
• family Pempheridae
• family Peneidae
• family Pennatulidae
• family Peramelidae
• family Percidae
• family Percophidae
• family Peridiniidae
• family Peripatidae
• family Peripatopsidae
• family Peronosporaceae
• family Pertusariaceae
• family Petromyzontidae
• family Pezizaceae
• family Phaethontidae
• family Phalacrocoracidae
• family Phalangeridae
• family Phalangiidae
• family Phalaropidae
• family Phallaceae
• family Phasianidae
• family Phasmatidae
• family Phasmidae