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positive 
1 absolute, actual, affirmative, categorical, certain, clear, clear-cut, conclusive, concrete, decisive, definite, direct, explicit, express, firm, incontrovertible, indisputable, real, unequivocal, unmistakable 
2 assured, certain, confident, convinced, sure 
3 assertive, cocksure, decided, dogmatic, emphatic, firm, forceful, opinionated, peremptory, resolute, stubborn 
4 beneficial, constructive, effective, efficacious, forward-looking, helpful, practical, productive, progressive, useful 
5  (informal) absolute, complete, consummate, out-and-out, perfect, rank, thorough, thoroughgoing, unmitigated, utter 
 
Antonyms  
 
1 contestable, disputable, doubtful, inconclusive, indecisive, indefinite, uncertain 
2 not confident, unassured, uncertain, unconvinced, unsure 
3 diffident, open-minded, receptive, retiring, timid, unassertive, unobtrusive 
4 conservative, detrimental, harmful, impractical, reactionary, unhelpful, useless