You can use a weaselword like "unconstitutional" if you wish, but facts are facts.
Can you cite a specific law that wasn't enacted?
In the Terri case they were following the laws, due process was done - and seen to be done - but people were not happy with the result.
And 'unconstitional' is hardly a weasel word. The Constitution is what elected officials swear to uphold. Trash that and what's left of the US?