From Longman Dictionary of Contemporary Englishgutlessgut‧less /ˈɡʌtləs/ adjective informal BRAVElacking courage or determination SYN spineless I should have had the support of my team, but they were really gutless.
Examples from the Corpus
gutless• You were gutless, but that's par for the course.• a gutless decision• Dot realized she'd already left to visit the man who was a gutless jink.• That is why the gutless time-servers at the Polytechnic asked me to leave. 