immaturely
UK /ɪməˈtjʊə(ɹ)li/ US /ɪməˈtjʊə(ɹ)li/
adv 2
Definitions
adv
1
Giving an appearance of immaturity; childishly.
They may be approaching 40, but after three beers they are behaving as immaturely as any teenager.
2
Without having attained maturity.
[…] birds which are hatched immaturely and fly immediately after leaving the nest.
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