syn- /sin-/, sy- /si-/, syl- /sil-/, sym- /sim-/ or sys- /sis-/

Signifying together, with

• not have a cat in hell's chance
• not have a clue
• not have a hope in hell
• not have a leg to stand on
• not have the faintest
• not have the foggiest
• not-headed
• not hear of
• nothing
• nothingarian
• nothingarianism
• nothingarians
• nothing but
• nothing doing
• nothing for it but
• nothing-gift
• nothing-gifts
• nothing if not
• nothing in it
• nothingism
• nothingisms
• nothing less than
• nothing loath
• nothingness
• nothingnesses