The two first stages of the analysis resulted in separating a free and a bound form:
1) un- + gentlemanly,
2) gentleman + -ly.
The third cut has its peculiarities.
The devision into gent- + -leman is obviously impossible as no such patterns exist in English, so the cut is gentle + man.
A similar pattern is observed in nobleman, and so we state adjective stem + -man. The word gentle is open to discussion. If we compare it with such adjectives as brittle, fertile, juvenile, little, noble, subtle and some more containing the suffix -le/-ile added to a bound stem, they form a pattern for our case.
To sum up: as we break the word we obtain at any level only two ICs, one of which is the stem of the given word. All the time the analysis is based on the patterns characteristic of the English vocabulary. As a pattern showing the interdependence of all the constituents segregated at various stages we obtain the following formula:
un- + {[(gent- + -le) + -man] + -ly} This method of analysis is extremely fruitful in discovering the derivational structure of words.