Effectiveness adjectives are listed in this post. Each word below can often be found in front of the noun effectiveness in the same sentence. This reference page can help answer the question what are some adjectives commonly used for describing EFFECTIVENESS.
actual, administrative, apparent, biological, clinical, comparative, continued, cost, devastating, differential, dramatic, economic
educational, equal, full, future, general, great, greater, greatest, high, higher, highest, immediate
improved, individual, institutional, instructional, interpersonal, less, likely, limited, low, managerial, maximal, maximum
military, more, operational, optimal, organizational, overall, own, personal, political, possible, potential, practical
professional, proven, questionable, real, reduced, relative, remarkable, rhetorical, same, similar, social, spiritual
strategic, such, superior, term, theatrical, therapeutic, total, true, ultimate
Hope this word list had the adjective used with effectiveness you were looking for. Additional describing words / adjectives that describe / adjectives of various nouns can be found in the other pages on this website.