1. Characterized by quickness and firmness
   "his reply was unhesitating"
   - resolute

See also: decisive, unhesitatingly

• undervest
• underwater
• underwater archaeology
• underwater archeology
• underwater diver
• underway
• underwear
• underweight
• underwhelm
• underwing
• underwood
• underworld
• underwrite
• underwriter
• undescended
• undescended testicle
• undescended testis
• undescriptive
• undeserved
• undeservedly
• undeserving
• undesigned
• undesirability
• undesirable
• undesirably