Entry 1 sense Webster, 1913 Heedless · Heed·less · IPA /ˈhiːdləs/ 01 a. Without heed or care; inattentive; careless; thoughtless; unobservant. 1. Without heed or care; inattentive; careless; thoughtless; unobservant. “O, negligent and heedless discipline!” — Shak. “The heedless lover does not know Whose eyes they are that wound him so.” — Waller.