Correct spelling for the English word "Understanded" is [ˌʌndəstˈandɪd], [ˌʌndəstˈandɪd], [ˌʌ_n_d_ə_s_t_ˈa_n_d_ɪ_d] (IPA phonetic alphabet).
The word "understanded" is not a commonly used term in contemporary English. However, it could be considered an archaic or dialectal form of "understood". The etymology of "understood" is traced back to Middle English. In Middle English, there was a compound verb construction "understanden", formed by combining the Old English prefix "under" (meaning "between", "among", or "in the midst of") and the Old English verb "standan" (meaning "to stand"). "Understanden" meant "to stand among or between" or "to be familiar with", and over time it evolved to signify "to comprehend" or "to grasp the meaning of something". Eventually, the past participle form of "understanden" turned into "understood", which is the commonly used term today.