childish
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childish
In a childlike way that is inappropriate, immature, or silly for adults. Usually used negatively.
Sei nicht so kindisch und hör auf, wegen dieser Kleinigkeit zu schmollen.
Don't be so childish and stop sulking over this little thing.
The adjective is derived from the noun 'das Kind' (child) with the ending '-isch' (-ish). This ending describes a quality or behavior that is typical of something, here often with a negative evaluation.
Seine Reaktion auf die Kritik war ziemlich kindisch.
His reaction to the criticism was pretty childish.
'Kindisch' (childish) is almost always a criticism or reproach. It describes an adult's behavior as immature, silly, or inappropriate, not as positive or innocent.
Hör auf, so kindisch zu sein, und sprich vernünftig mit mir!
Stop being so childish and talk to me sensibly!
'Kindisch' (childish) often describes a behavior or reaction. Typical combinations are 'kindisches Verhalten' (childish behavior), 'eine kindische Reaktion' (a childish reaction), or use with verbs like 'sich benehmen' (to behave) and 'reagieren' (to react).
Er benimmt sich manchmal sehr kindisch, wenn er nicht bekommt, was er will.
He sometimes behaves very childishly when he doesn't get what he wants.
stupid / annoying
'blöd' and 'kindisch' can both describe immature or silly behavior. 'kindisch' more specifically means that someone behaves like a child, even though that does not fit the situation. It usually sounds critical. 'blöd' is broader and can also simply mean silly, stupid, or annoying. Learners may confuse the words because both are used for behavior. If you want to emphasize immaturity, 'kindisch' fits better. If you just want to say casually that something was silly or not especially smart, 'blöd' often fits.
Im Gespräch wirkte sein Verhalten kindisch, weil er sofort beleidigt war.
In the conversation, his behavior seemed childish because he immediately felt offended.
Noah findet es blöd, wenn seine Freunde beim Essen nur Quatsch machen.
Noah finds it annoying when his friends just mess around during meals.