nebbish (n.)

• baby
• chicken
• cipher
• crybaby
• doormat
• dud
• dummy
• figurehead
• invertebrate
• jackstraw
• jellyfish
• lightweight
• mediocrity
• milksop
• mollycoddle
• namby-pamby
• nobody
• nonentity
• nothing
• nullity
• obscurity
• pansy
• pantywaist
• pip-squeak
• punk
• puppet
• pushover
• runt
• scrub
• shrimp
• sissy
• softy
• sop
• squirt
• squit
• trifle
• weakling
• whippersnapper
• zero