"unstudied" in the adjective sense
1. unstudied, uncontrived
not by design or artifice unforced and impromptu
"an air of unstudied spontaneous utterance is apt to be painstakingly achieved"
"simple unstudied charm"
2. unstudied
lacking knowledge gained by study often in a particular field
"is unstudied in Latin as he is in may other matters"
Source: WordNet® (An amazing lexical database of English)
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