Neglect indica el no poner suficiente atención a algo que exige la atención o el cuidado de uno <having fun every night and neglecting his studies>.
Disregard connota una falta voluntaria de atención <disregarded the wishes of the other members>.
Ignore indica la omisión, a veces deliberada, de atender o reconocer algo que es obvio <ignored the nasty comments>. antonyms: heed, acknowledge
Overlook connota desatender o ignorar mediante la prisa o la falta de cuidado <in his rush he had overlooked some important examples>.
Slight indica el ignorar u omitir con desprecio o desdén <she claimed that the memo had slighted her own work>.
Forget puede connotar ya el ignorar de manera voluntaria, o el no grabar uno algo en la mente <forget what your friends say and listen to your conscience>.
Discount connota minimizar la importancia o el valor de algo <you shouldn't discount his opinions>.