1 producing the result you want
VERBS be, look, prove, seem | make sth | find sth We find advertising on the radio very effective.
ADV. brilliantly, especially, extremely, highly, particularly, really, remarkably, very a highly effective technique | completely, fully, perfectly | increasingly | fairly, moderately, partially, pretty, quite, rather, reasonably | enough This method is effective enough with greenfly. | not sufficiently | immediately | potentially | devastatingly, powerfully, surprisingly Sneezes are devastatingly effective at spreading infection. | politically What makes a TV programme politically effective?
PREP. at effective at keeping out the wind | in effective in helping people to stop smoking
2 of laws/rules
VERBS be | become | remain
ADV. fully | partially | directly, immediately directly effective treaty provisions | legally