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manual
This word carries a strong association with tactile control and human effort. When used as an adjective, it often implies a lack of automation, which can be perceived as either tedious or, conversely, as providing a higher degree of precision and mastery over a machine. As a noun, it evokes the image of a technical guide. While modern technology has shifted toward digital help files, the term still suggests a comprehensive, structured source of truth for troubleshooting and operational procedures.
Countable when referring to a physical handbook ('I bought two manuals'). Uncountable when referring to the general concept of hand-operated work ('The job requires a lot of manual').