Sentence:  He felt horribly ashamed. He would have liked to throw himself on his knees beside her, put his arms round her, and ask her pardon. But he could do nothing of the kind; the scene had left him <WSD>lumpish</WSD> and awkward. 
Meaning of the word marked with <WSD> tags:  Like a lump, cloddish, dull, slow-witted.