Characterized by or prone to headaches; having a quality of causing head pain or mental distress.
From 'headache' (head + ache) plus the adjective-forming suffix '-y'. This construction became common in English to describe a state or condition associated with a noun.
Adding '-y' to nouns is one of English's favorite tricks for making adjectives—it works with almost anything: rainy, sleepy, grumpy, or headachy!
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