Similar to a stereotypical dumb blonde.(adjective)
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Use "blondish" in a sentence
"LEGUIZAMO: I did the same thing because mine came out kind of blondish, and I wasn't sure."
"Because mine came out kind of blondish, and I wasn't sure."
"Backing up her spirited personality with a blondish lacquered coif and impeccable designer clothes, Bullock bears a resemblance to Kathie Lee Gifford."