In Pakistan, adult literacy programs are offered to enable learners to function effectively to attain individual, family, and social sustainability, but these programs are continuously reporting low participation. This study aimed to explore the reasons behind low participation, employing a descriptive phenomenological design to examine the challenges experienced by adult learners, literacy teachers, and administrators. Forty-five participants (30 learners, 10 teachers, and 5 administrators) were selected by using a purposive sampling technique. Data were gathered through focus group discussions and semi-structured interviews, and a thematic analysis was conducted. Numerous challenges were found, including less attractive, non-relevant literacy content, inappropriate presentation methods, lack of proper mechanisms for teachers' training, and learners' evaluation. Based on the evidence, practical implications were proposed, with a particular emphasis on adult learners and literacy teachers.