Had a handle on means to have an understanding or control over something. The antonym of this phrase would be to not have a handle on something. Other antonyms for this phrase could be unacquainted, unfamiliar, unaware, uninformed, uncertain, confused, or ignorant. When you do not have a handle on something, you lack the knowledge, skill, or experience to properly manage the situation. It is important to recognize when you do not have a handle on something and seek guidance or assistance to avoid making mistakes or causing harm. By improving your understanding and skills, you can gain a handle on even the most challenging situations.