〜じみる・〜じみた
smacking of, looking like (negative)
Noun + じみる / じみた + Noun / じみて
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じみる means something seems like a noun, in an unwelcome way: 子どもじみたことを言うな, "stop saying such childish things".
It follows nouns such as 子ども ("childish"), 年寄り ("old-fashioned"), 説教 ("preachy"), 芝居 ("theatrical, put on") and 所帯 ("drab, domestic"). Before a noun, it's じみた.
It's always critical. Compare めく, which is mostly neutral ("showing signs of"), and らしい (N3), which is positive ("typical of, as it should be"). A 子どもらしい drawing is charmingly childlike, while a 子どもじみた remark is immature.
It conjugates like an ichidan verb: じみる, じみて, じみた.
Examples
子どもじみたことを言うな。
Stop saying such childish things.
彼女は年寄りじみた服を着ている。
She wears clothes that make her look old.
彼の話は説教じみていて、聞き飽きた。
His talk was preachy, and I got tired of it.
最近、彼女は所帯じみた格好をしている。
Lately, she's been dressing in a frumpy, domestic way.
芝居じみた謝り方だった。
It was a theatrical, insincere apology.