We found one dictionary that defines the word not the sharpest knives in the drawer:

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1. not the sharpest knives in the drawer: Wiktionary

▸ Words similar to not the sharpest knives in the drawer ▸ Usage examples for not the sharpest knives in the drawer ▸ Idioms related to not the sharpest knives in the drawer ▸ Wikipedia articles (New!) ▸ Words that often appear near not the sharpest knives in the drawer ▸ Rhymes of not the sharpest knives in the drawer ▸ Invented words related to not the sharpest knives in the drawer