Much cleaner solution than the currently accepted answer: Add the mobileFirst: true, option:

$('.slider').slick({
     slidesToShow: 5,
     slidesToScroll: 1,
     autoplay: false,
     autoplaySpeed: 2000,
     mobileFirst: true,
     responsive: [
        {
           breakpoint: 767,
           settings: "unslick"
        }
     ]
  });

This will interpret your breakpoint settings starting from low resolutions, as intended.

See the settings section in the Slick documentation.

Try this: screen width 9999px to 768px will not be slider

('.slider').slick({
    slidesToShow: 5,
    slidesToScroll: 1,
    autoplay: false,
    autoplaySpeed: 2000,
    responsive: [
        {
            breakpoint: 9999,
            settings: "unslick"
        },
        {
            breakpoint: 767,
             settings: {
                    slidesToShow: 3,
                    slidesToScroll: 3,
                    infinite: true,
                    dots: true
                }
        }
    ]
});

Unfortunately my version of #user1506075 did not work without errors. I solved the problem this way:

 $slickGreen = false;
    function greenSlider(){    
        if($(window).width() < 991){
            if(!$slickGreen){
                $(".greenSlider").slick({
                    dots: false,
                    arrows: false,
                    slidesToShow: 3,
                    slidesToScroll: 1
                });
                $slickGreen = true;
            }
        } else if($(window).width() > 992){
            if($slickGreen){
                $('.greenSlider').slick('unslick');
                $slickGreen = false;
            }
        }
    };

    $(document).ready(function(){
        ....
        greenSlider();
    });
    $(window).on('resize', function(){
         ....
         greenSlider();
    });