Noah Webster's Dictionary (a.) Without heed or care; inattentive; careless; thoughtless; unobservant.

Multi-Version Concordance Heedless (2 Occurrences) Luke 16:13 No domestic is able to serve two lords, for either the one he will hate, and the other he will love; or one he will hold to, and of the other he will be heedless; ye are not able to serve God and mammon.' (YLT) Proverbs 13:10 The only effect of pride is fighting; but wisdom is with the quiet in spirit. (See RSV)