Circumspect (DD definition link)
Well, I could probably do this etymology on my own, "circum" being Latin for "around" and "spect" for "to look". Let's see if I'm right. Except for the full verb form "specere", yep. So, literally, circumspect means "to look around". Now, in practice, it has taken on a greater meaning of not just "to look around" but to look at everything in order to be aware of everything, and then, that such observation is naturally cautious or prudent.
Of course, with such a meaning of "to look around" as a preventative measure, it really only gets applied to people (and their direct activities). Being an insurance defense attorney, she was religiously circumspect to her environment and any potential liabilities. Well, of course! Some of his more extreme circumspect measures included sweeping the room with infrared before entering. Now, don't confuse this word with "suspect" which implies that the activity is not reputable or credible. My black cat is less than circumspect when she enters a dark room and decides to lay in the entrance. Probably not. I could do to be more circumspect when I enter a dark room to make sure I don't kick my black cat. Better, although as per the above, I never do that. Plaintiff's counsel needs to be circumspect to the lies their clients tell them. Yes. After studying the etymologies of certain words, she will be more circumspect to their correct usage, lest she be misunderstood. Yes.