First thanks to all for being helpful, your suggestions triggered (it took 14 hours) in me recollection of one forgotten but lovely BBC serial:
Comedy set in different historical periods that features the ill-fated exploits of the mean-spirited Edmund Blackadder and his dim sidekick Baldrick. Starring Rowan Atkinson.
Mr. Atkinson is one of my favorite actors, yet, his superb performance didn't pop up at once, perhaps due to my concentration on the present problems, a shame.
For those who didn't watch the series, find time, it is totally worth it.
I believe 'blackadder' is the word I was looking for since it fits almost perfectly, it carries the main features of a 'terrorist' without being so strong:
- venomous attack coming of out nowhere, you know it is one of those repulsive snakes hiding;
- blah-blah, just nasty viper.
Interesting etymology found in Wikipedia:
The name "adder" is derived from nædre an Old English word that had the generic meaning of serpent in the older forms of many Germanic languages. It was commonly used in the Old English version of the Christian Scriptures for the devil and the serpent in the Book of Genesis.
Quite well, devil/serpent, as said in the Bible, does this-and-that to you and afterwards says: 'I don't know you', this 'covers' the IRRESPONSIBILITY.
Very happy for the precious flashback, finally two words describe the situation: