I would never say, "word is inappropriate". I would say, "This word is inappropriate". It's clearer and there's almost no cost to using a well-formed sentence.

Similarly, I find comments where the single word "this" is used as an entire sentence detract from a forum based site. I can talk to u in allthememes! and sms abbreviations, but I chose to save that register for chat and look for something a bit more correct on forums. I readily admit that HN has been slowly trending away from that for nearly its entire existence.