1. In a terrible manner
   - terribly, awfully, abominably, abysmally, rottenly, appallingly, execrably 
2. To an extravagant or immoderate degree
   "atrociously expensive"
   - outrageously

See also: atrocious

• declare oneself
• declared
• declarer
• declass
• declassification
• declassified
• declassify
• declaw
• declension
• declensional
• declinable
• declination
• decline
• decline in quality
• decliner
• declinometer
• declivitous
• declivity
• Declomycin
• declutch
• deco
• decoagulant
• decoct
• decoction
• decoction mashing