Full of annoyance; annoying or irritating in quality.
From 'annoy' plus the suffix '-ful' (full of), creating 'annoyful'—a formation that exists but is quite rare in modern English.
This word feels right—it follows English's favorite pattern (joyful, hopeful, fearful)—yet we almost never use it, choosing 'annoying' instead. Language isn't always logical!
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