in an immature manner
annoyingly, artlessly, boringly, drably, drearily, dully, horridly, immaturely, ingenuously, innocently, maddeningly, monotonously, naively, naïvely, simply, tediously, tiresomely, unaffectedly, unpleasantly
Really it is a totally new word for me and also it is interesting for me to know it. Also many synonyms are written at urduwire.com here.
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