certain(sure, positive, not doubting) adjective [UK: ˈsɜːt.n̩] [US: ˈsɝː.tn̩]I don't know for certain. = No sé a ciencia cierta.
true [truer, truest](concurring with a given set of facts) adjective [UK: truː] [US: ˈtruː]That's true. = Eso es cierto.
ciertodeterminer {m}
certain(having been determined but not specified) determiner [UK: ˈsɜːt.n̩] [US: ˈsɝː.tn̩]I don't know for certain. = No sé a ciencia cierta.
aciertonoun {m}
success [successes](achievement of one's aim or goal) noun [UK: sək.ˈses] [US: sək.ˈses]
conciertonoun {m}
concert [concerts](agreement in a design or plan) noun [UK: kən.ˈsɜːt] [US: ˈkɑːn.sərt]I went to a concert. = Fui a un concierto.
concerto [concertos](a piece of music for one or more solo instruments and orchestra) noun [UK: kən.ˈtʃeə.təʊ] [US: kən.ˈtʃerto.ʊ]Mozart's Clarinet Concerto is not included in the CD you bought. = El concierto para clarinete de Mozart no está incluso en el CD que has comprado.
desconciertonoun
bewilderment(state of being bewildered) noun [UK: bɪ.ˈwɪl.də.mənt] [US: bə.ˈwɪl.dər.mənt]
indecisive(inconclusive or uncertain) adjective [UK: ˌɪn.dɪ.ˈsaɪ.sɪv] [US: ˌɪn.də.ˈsaɪ.sɪv]
uncertain(not known for certain; questionable) adjective [UK: ʌn.ˈsɜːt.n̩] [US: ʌn.ˈsɝː.tn̩]The outcome of war is uncertain. = El resultado de la guerra es incierto.