This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Like a nerd; having the traits of a nerd.

"It was a far cry from the geeky glasses and garish ties he sported during his early Blair years when he was dubbed "Brains" after the nerdish Thunderbirds puppet."

geekish   

nerdy   

nerdishness    nerdishly