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sure 
1 assured, certain, clear, confident, convinced, decided, definite, free from doubt, persuaded, positive, satisfied 
2 accurate, dependable, effective, foolproof, honest, indisputable, infallible, never-failing, precise, reliable, sure-fire  (informal) tried and true, trustworthy, trusty, undeniable, undoubted, unerring, unfailing, unmistakable, well-proven 
3 assured, bound, guaranteed, ineluctable, inescapable, inevitable, in the bag  (slang) irrevocable 
4 fast, firm, fixed, safe, secure, solid, stable, staunch, steady 
 
Antonyms  
 distrustful, dodgy  (Brit., Austral., & N.Z. informal) doubtful, dubious, fallible, iffy  (informal) insecure, sceptical, touch-and-go, unassured, uncertain, unconvinced, undependable, uneasy, unreliable, unsure, untrustworthy, vague 



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