Antonyms for the word "wast careless" can be defined as being attentive, cautious, diligent, meticulous, thoughtful, and thorough. Being attentive implies paying close attention to all the details, being vigilant, and not letting anything slip away. Acting with caution means being careful, taking precautions, and not taking unnecessary risks. Diligence refers to having a steady and consistent effort, being hard-working, and a strong work ethic. Being meticulous involves paying close attention to detail, striving for perfection, and being thorough in all tasks. Being thoughtful implies being considerate, mindful, and putting careful consideration into decisions. Finally, acting with thoroughness refers to being comprehensive, complete, and leaving no stone unturned.