| efficacious | adj berkesan; (of medicine, remedy) mujarab, mustajab, manjur. | Kamus Inggeris-Melayu Dewan |
| ineffective | adj 1. not producing desired result, tdk /berkesan, efektif/; (of remedy) tdk /mujarab, mustajab/: the economic sanction was ~, sekatan ekonomi itu tdk berkesan; these so-called remedies are ~, yg dikatakan ubat ini tdk mujarab; 2. inefficient, not capable, tdk /cekap, efektif/: a weak, ~ leader, pemimpin yg lemah dan tdk cekap. | Kamus Inggeris-Melayu Dewan |
| effective | adj 1. having an effect, efficient, berkesan, efektif; (so as to be impressive) mengesankan: ~ measures to reduce inflation, langkah-langkah yg berkesan utk mengurangkan inflasi; the choice of colour combination was very ~, pilihan kombinasi warna sangat mengesankan; 2. (of medicine, remedy) mujarab, mustajab, manjur: an ~ ointment for eczema, salap ekzema yg mujarab; 3. operative, mula /berkuat kuasa, dikuatkuasakan/: the law is ~ from the first of January, undang-undang ini mula berkuat kuasa pd satu hari bulan Januari;4. actual, hakiki: the full strength of this battalion is 1,000, but the ~ strength is 800, kekuatan penuh batalion ini ialah 1,000, tetapi kekuatan hakikinya ialah 800; | Kamus Inggeris-Melayu Dewan |