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

See also: remorseless

• electron beam
• electron gun
• electron lens
• electron microscope
• electron microscopic
• electron microscopy
• electron multiplier
• electron optics
• electron orbit
• electron paramagnetic resonance
• electron radiation
• electron shell
• electron spin resonance
• electron tube
• electron volt
• electronegative
• electronegativity
• electroneutral
• electronic
• electronic balance
• electronic bulletin board
• electronic communication
• electronic computer
• electronic converter
• electronic counter-countermeasures