Full of groans; characterized by or producing many groans of pain, distress, or disapproval.
From groan plus the adjectival suffix -ful, meaning 'full of.' This formation allows the quality of being full of groaning to be expressed as an adjective.
English's -ful suffix is incredibly productive, letting speakers create new descriptors on the fly — you could technically call a terrible comedy show 'groanful' and English speakers would instantly understand!
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