1. In a harmfully insidious manner
   "these drugs act insidiously"
   - perniciously

See also: insidious

• superabundance
• superabundant
• superadd
• superaddition
• superannuate
• superannuated
• superannuation
• superannuation fund
• superb
• superbia
• superbly
• superbug
• Supercalifragilisticexpialidocious
• supercargo
• supercede
• supercharge
• supercharged
• supercharger
• superciliary
• superciliary arch
• superciliary ridge
• supercilious
• superciliously
• superciliousness
• supercilium