The phrase "putting on air" implies pretense, affectation or insincerity, so antonyms for it would include terms like authenticity, sincerity, honesty or genuine behavior. Other antonyms for the phrase could be real, honest, natural, unpretentious and genuine. To abandon pretense and be authentic can be difficult, but an honest and genuine attitude can foster positivity and foster trust in oneself and others. It is important to cultivate habits that promote authenticity, such as self-reflection, self-awareness, and a willingness to listen and understand the perspectives of others. Thus, we must strive to avoid putting on airs and embrace our true selves.