Because the molecules in liquids are much more spread out, there is more room between them to compress. Compressing a liquid is a bit more difficult than compressing a gas but not nearly as difficult as compressing a solid. With this said, we should look at the term 'easy' as being relative.
You can place and displace liquids easily. A great amount of pressure is needed to compress any liquid, and typically the know-how to do so is found in a lab or with a scientist.
Yes, liquids are easy to compress. Compressibility is a measure of the relative volume change of a fluid or a solid as a response to a pressure change. You can compress liquids; however, it requires a great deal of pressure to accomplish a little compression.
Liquids and solids are sometimes thought of as being incompressible. In liquids, there is no gap between particles, so the only way you can compress it is by reducing the gap at the molecular level. This changes the state of that material, which involves vast energy. Under moderately high increases in pressure, they do compress a little.