marked by or paying little heed or attention; "We have always known that heedless self-interest was bad morals; we know now that it is bad economics"--Franklin D
characterized by careless unconcerned; "the heedless generosity and the spasmodic extravagance of persons used to large fortunes"- Edith Wharton; "reckless squandering of public funds"
If you are heedless of someone or something, you do not take any notice of them. Heedless of time or any other consideration, they began to search the underwater cave She was rummaging through the letters, scattering them about the table in her heedless haste. heedless of sth not paying attention to something