1. In an uncalled-for manner
   "he insulted us gratuitously"

See also: gratuitous

• bubble chamber
• bubble dance
• bubble gum
• bubble gum dermatitis
• bubble over
• bubble pack
• bubble shell
• bubble up
• bubblejet
• bubblejet printer
• bubbler
• bubbliness
• bubbling
• bubbly
• bubby
• Buber
• bubo
• Bubo virginianus
• bubonic
• bubonic plague
• Bubulcus
• Bubulcus ibis
• buccal
• buccal artery
• buccal cavity