The spelling of the word "un ablest" is simply incorrect. It should be spelled as "unablest" which means the least able or incapable. The correct IPA phonetic transcription of "unablest" is /ʌnˈeɪblɪst/. This word is derived from the adjective "able" which means having the power, skill, or means to do something. Adding the prefix "un-" before "ablest" negates its meaning and produces the opposite – least able or incapable.