1. Not to be placated or appeased or moved by entreaty
   - grim, inexorable, relentless, stern, unforgiving, unrelenting

See also: implacable

• abelia
• abelian
• Abelian group
• Abelmoschus
• Abelmoschus esculentus
• Abelmoschus moschatus
• abelmosk
• Abenaki
• abend
• Aberdare
• Aberdeen
• Aberdeen Angus
• Aberdonian
• aberrance
• aberrancy
• aberrant
• aberrantly
• aberrate
• aberration
• aberrational
• abet
• abetalipoproteinemia
• abetment
• abettal
• abetter