Resembling or characteristic of a guidebook; written or presented in the style of travel or instructional guides.
From guidebook plus -y (an informal suffix meaning 'having the quality of'), creating a more colloquial variant than 'guidebookish' with a slightly lighter tone.
The existence of both 'guidebookish' and 'guidebooky' shows how English speakers constantly experiment with suffix combinations—neither is 'standard,' but both effectively communicate the same judgment about style.
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