Contexts . Having a practical or beneficial use. Providing a benefit when used. Practical in nature. Very able or competent in a particular area. … more . …
Some common synonyms of formal are ceremonial, ceremonious, and conventional. While all these words mean "marked by attention to or adhering strictly to prescribed forms," formal applies both to things prescribed by and to persons obedient to custom and may suggest stiff, restrained, or old-fashioned behavior. a formal report.
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useful - Cambridge English Thesaurus with synonyms and …