怠慢
たいまん · taiman · JLPT N1 · noun
negligence
慢 — heart radical 忄 + 曼 màn (phonetic)
慢 is a phonetic-semantic compound. The heart radical 忄 signals a feeling or mental state, while 曼 supplies the sound màn. Originally it meant 'lazy' or 'negligent,' a slack state of mind, and later shifted to its modern sense of 'slow.'