overgrown

From over- +‎ grown.

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• Rhymes: -əʊn

overgrown (comparative more overgrown, superlative most overgrown)

1. Having large numbers of plants which have become too big, and are hence spoiling the picturesqueness of a garden.
2. (attributive, mildly derogatory) Having grown bigger without developing maturity or changing character.

   He spends so much money on new technology: he's like an overgrown schoolboy buying toys.

overgrown

1. past participle of overgrow