Opposite of not producing the expected result
“Johnny was proud of his B+ grade in science, and his mother said it was good enough.”
Opposite of unsuitable for a particular purpose
“These sharp scissors are effective for hairdressing.”
Displaying outstanding skill, knowledge, or experience in a given field
“In demonstrating his versatility, he shows himself to be as much skillful artisan as easy-going metaphysician.”
Worthy of respect or admiration
“In the case of Van Straalen, the services rendered by him during his long and honourable career have been remarkable.”
(adequate to) Equal to some requirement
“Funding should be provided to recruit and train police officers adequate to the task.”
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