The difference between Obligatory and Perfunctory
When used as adjectives, obligatory means imposing obligation, legally or morally, whereas perfunctory means done only to fulfil a duty, or in a careless or indifferent manner.
check bellow for the other definitions of Obligatory and Perfunctory
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Obligatory as an adjective:
Imposing obligation, legally or morally; binding.
Examples:
"an obligatory promise"
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Obligatory as an adjective:
Requiring a matter or obligation.
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Perfunctory as an adjective:
Done only to fulfil a duty, or in a careless or indifferent manner; performed mechanically and as a thing of rote.
Examples:
"He did a perfunctory job cleaning his dad's car, finishing quickly but leaving a few spots still dirty."