Synonyms for Competent (same or very similar meaning)
WordNet sense 1 (legally qualified):
qualifiedWordNet sense 2 (able to accomplish a purpose; functioning effectively):
efficientWordNet sense 3 (have the skills and qualifications to do things well):
able, capableWordNet sense 4 ((sometimes followed by `to') meeting the requirements especially of a task):
adequateFrom the ODE community, based on WordNetadd/edit