immaturely

Adverb

Meaning

In an immature manner.

Source: Webster's dictionary

jejunely juvenile carelessly negligently rashly foolishly irresponsibly greenly childishly hastily haphazardly boyishly crudely prematurely recklessly

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maturely completely correctly readily carefully perfectly

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his teenage son still behaves very immaturely Source: Internet

immature someone immature toad immatured immatureness immaturity immeability