Collocations for effective - adj.

be, look, prove, seem
make sth
find sth
We find advertising on the radio very effective.

extremely, fairly, very, etc.
enormously, especially, extraordinarily, highly, incredibly, remarkably, tremendously
a highly effective technique

completely, fully, totally, truly
especially, particularly
moderately, partially, reasonably
equally
generally
The drug is generally effective in reducing pain.

increasingly
surprisingly
consistently
enough
This method is effective enough with greenfly.

not sufficiently
immediately
potentially
devastatingly, powerfully
Sneezes are devastatingly effective at spreading infection.

politically
What makes a speech politically effective?

at
effective at keeping out the wind

in
effective in helping people to stop smoking

be
become
remain

fully
partially
directly, immediately
directly effective treaty provisions

legally

Effective is used with these nouns:
action, administration, advocate, agent, aid, alternative, answer, antibiotic, antidote, barrier, birth control, blockade, camouflage, campaign, campaigner, challenge, change, channel, collaboration, communication, contraception, contraceptive, control, cooperation, coordination, counter, counter-attack, critique, cure, date, defence, delegation, deployment, deterrent, diplomacy, discipline, drug, enforcement, engagement, execution, exercise, exploitation, expression, implementation, instrument, intervention, leader, leadership, learning, legislation, liaison, management, marketing, means, measure, mechanism, method, mode, monopoly, operation, opposition, organization, participation, partnership, piece, ploy, policy, presentation, protection, reform, remedy, removal, representation, resistance, resolution, response, ruler, safeguard, sanction, solution, strategy, supervision, system, teaching, teamwork, technique, tool, treatment, use, vaccine, veto, way, weapon, writing