1. Lacking courage or vitality
   "he was a yellow gutless worm" 
2. Weak in willpower, courage or vitality
   - namby-pamby, spineless, wishy-washy

See also: gutlessness, weak

Antonym: gutsy

• sphincter
• sphincter ani
• sphincter muscle
• sphingid
• Sphingidae
• sphingine
• sphinx
• sphinx moth
• sphragistics
• sphygmograph
• sphygmomanometer
• Sphyraena
• Sphyraena barracuda
• Sphyraenidae
• Sphyrapicus
• Sphyrapicus varius
• Sphyrapicus varius ruber
• Sphyrna
• Sphyrna tiburo
• Sphyrna tudes
• Sphyrna zygaena
• Sphyrnidae
• spic
• spic-and-span
• spica