1. Pertaining to someone who is uncouth or unpolished: Sam was born in the country and lived there his whole life, was quite agresty and didn't know how to be refined or elegant in his ways.
2. Relating to unwanted vegetation: There were many agresty plants in Jim's garden that he had to weed out.
3. Etymology: from the Latin agrestis; from ager, "a field"; a close relative of agriculture and of agrestal, which refers to "uncultivated plants that are growing on cultivated land">