Since nobody else has yet come up with an answer, I thought I'd at least try for you...
Clearly this doesn't look like a native Hebrew word, so following that logic it must have been borrowed from another language...(and hopefully retains the same sense)...
I have only been able to find this word in a Hungarian variant "nemtörődöm" which means "reckless" or "negligent".
Although not sure if this fits, in the sentence, in the context. It's just a shot in the dark in the absence of anything else.

Hence the really low confidence rating. I might be totally off the mark here. This one stumped me.