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effective▼(having the power to produce a required effect or effects)adjective[UK: ɪ.ˈfekt.ɪv] [US: ɪ.ˈfekt.ɪv]
efficacious▼(effective, see also: effective)adjective[UK: ˌe.fɪˈk.eɪ.ʃəs] [US: ˌe.fəˈk.eɪ.ʃəs]
efficient▼(making good use of resources)adjective[UK: ɪ.ˈfɪʃnt] [US: ə.ˈfɪ.ʃənt]
fruitful▼(productive, yielding benefits)adjective[UK: ˈfruːt.fəl] [US: ˈfruːt.fəl]
operative▼(effectual)adjective[UK: ˈɒ.pə.rə.tɪv] [US: ˈɑː.pə.rə.tɪv]
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