Cheating the weak like this is truly contemptible.
Tips
grammar
可 + verb pattern means 'worthy of being [verb]ed.' 鄙 means 'to despise,' so 可鄙 = 'worthy of contempt.' Same pattern: 可怕 (worth fearing → scary), 可爱 (worth loving → cute), 可惜 (pity), 可笑 (laughable).