intensive
US /ɪnˈten.sɪv/
UK /ɪnˈten.sɪv/

1.
concentrated on a single area or subject or into a short time; very thorough or vigorous.
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The course provides intensive training in computer programming.
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She underwent intensive therapy after the accident.
2.
(of a system or method) aiming to achieve maximum output or effect with minimum input.
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The farm uses intensive farming methods to maximize crop yield.
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The company implemented an intensive marketing campaign.