Resembling or characteristic of an alderman; having the manner, appearance, or qualities associated with aldermen.
From alderman + -like (suffix meaning 'resembling' or 'having the nature of'), a common English formation allowing comparison to a known type of person.
Shakespeare and his contemporaries used 'aldermanlike' to describe someone pompous or overly formal—showing that even then, aldermen had a reputation for taking themselves very seriously.
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