Half-hearted means lacking enthusiasm or not fully committed to something. Its antonyms include words such as wholehearted, enthusiastic, passionate, dedicated, committed, and resolute. Someone who is wholehearted is completely enthusiastic and committed to a particular cause or activity, while someone who is enthusiastic shows a great deal of excitement and interest in something. Being passionate suggests that one has strong feelings and is deeply committed to something, while being dedicated means that one is fully committed to achieving a particular goal. Similarly, a person who is committed is devoted to a particular task or activity, while someone who is resolute is determined and firm in their beliefs or decisions.