This teacher is typically known for having a firm grip on the fundamentals of the Faith, and yet is unpredictable enough to cause some confusion or even harm, however incidentally. A teacher may be irresponsible for a variety of reasons. On one hand, teachers who are more dynamic and gifted than they are educated regularly teach half-truths or error, albeit with sincerity. While on the other hand, extremely educated teachers may surprisingly permit or subscribe to a questionable belief incongruent with historic Christian orthodoxy. Such teachers are irresponsible due to how casually they treat the more "secondary" doctrines of Biblical truth.
Another reason a teacher may be considered irresponsible is due to embracing ministry partnerships with other irresponsible, dangerous, and even false teachers, whose doctrine contradicts the sound doctrine they publicly affirm. Such teachers lack the necessary discernment, being unaware of conflicting doctrinal teachings or conviction, valuing the idea of unity (and perhaps, peace) more than Biblical truth, the approval of man more than the approval of God.
Lastly, a teacher is considered irresponsible for reasons having little or nothing to do with what they teach, but rather how they live. Personal immaturity, pride, or license has a way of disqualifying otherwise safe Bible teachers. While these teachers have some things of value to say to the Church, they ultimately confuse, if not deceive, Christians by diluting an otherwise potent Gospel and muddling the clear message of Christian teaching.
Many Irresponsible & Dangerous Teachers are highly pragmatic. That is to say they despise the clear instruction of the Bible and deny the power of Christ to grow His Church how and when He decides to do it, and they over-emphasize human efforts to achieve measurable outcomes, namely numerical growth and money.
You will notice that Irresponsible, Dangerous, & False Teachers rarely, if ever, mention discernment unless it is to discourage it. Many of these teachers would rather preach unity ("unity" despite doctrine) so their teaching is no longer criticized, or to increase their influence and listenership.
Irresponsible, Dangerous, & False Teachers will often be those who permit women to be "pastors." Scripture prohibits women from exercising authority in the church. They therefore are, by God's design, not qualified to be pastors in the church.
Most Irresponsible, Dangerous, & False Teachers will frequently use multiple translations or "versions" (even paraphrases) of Scripture during a single sermon. This typically means they are looking for translations or paraphrases that help them say what they want to say. While pointing out the nuances of a translation from various sources can certainly be helpful, these teachers are motivated not by teaching what the Bible means, but by proof-texting to merely support their message's main points.
Galatians 2:11-16 - But when Cephas came to Antioch, I opposed him to his face, because he stood condemned. For before certain men came from James, he was eating with the Gentiles; but when they came he drew back and separated himself, fearing the circumcision party. And the rest of the Jews acted hypocritically along with him, so that even Barnabas was led astray by their hypocrisy. But when I saw that their conduct was not in step with the truth of the gospel, I said to Cephas before them all, “If you, though a Jew, live like a Gentile and not like a Jew, how can you force the Gentiles to live like Jews?”
James 3:1-3 - Not many of you should become teachers, my brothers, for you know that we who teach will be judged with greater strictness. For we all stumble in many ways. And if anyone does not stumble in what he says, he is a perfect man, able also to bridle his whole body.