This study presents the meanings, attributes, and roles of 'professionalism' synthesized from 20 Thai EFL teachers' perspectives. Qualitative research methods were utilized to collect four sources of data including classroom observation transcripts, semi-structured interview transcripts, on-line discussion entries, and field-note recordings. The findings indicated that professionalism refers to the big picture of exemplar, effective teachers. Proficient English skills with an emphasis on oral communication, lesson planning abilities, lesson delivery skills, and commitment to successful student learning were believed to form professionalism which, also, plays multi-roles in teaching.