<p><strong>Adjective</strong></p><ul><li>having or showing no regard; heedless; unmindful (often followed by of).</li><li>Synonyms: careless, neglectful, negligent, inattentive</li><li>Antonyms: mindful, attentive</li></ul><p><strong>Adverb</strong></p><ul><li>without concern as to advice, warning, hardship, etc.; anyway: I must make the decision regardless.</li></ul>