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

See also: gratuitous

• hideaway
• hidebound
• Hideki Yukawa
• hideous
• hideously
• hideousness
• hideout
• hider
• hidey-hole
• Hideyo Noguchi
• hiding
• hiding place
• hidrosis
• hidrotic
• hidy-hole
• hie
• hiemal
• Hieracium
• Hieracium aurantiacum
• Hieracium pilocella
• Hieracium praealtum
• Hieracium venosum
• hierarch
• hierarchal
• hierarchic