efficacious
adjective
[ ˌɛfɪˈkeɪʃəs ]
• (of something inanimate or abstract) successful in producing a desired or intended result; effective.
• "this treatment was efficacious in some cases"
Similar:
effective,
successful,
effectual,
productive,
constructive,
fruitful,
potent,
powerful,
worthwhile,
helpful,
of help,
of assistance,
beneficial,
advantageous,
valuable,
useful,
of use,
Origin:
early 16th century: from Latin efficax, efficac- (from efficere ‘accomplish’: see effect) + -ious.
