Sentence:  Again among those jubilantly reunited bunkmates , I was shy with Jessie and acted as I had during those early Saturday mornings when we all seemed to be playing for effect , to be detached and <WSD>unconcerned</WSD> with the girls who were properly our dates but about whom , later , in the privacy of our bunks , we would think in terms of the most elaborate romance . 
Meaning of the word marked with <WSD> tags:  lacking in interest or care or feeling