Négliger vs. délaisser
While both négliger and délaisser usually translate to "to neglect" in English, they express different nuances. Generally, négliger refers to a lack of care, attention, or maintenance, whereas délaisser implies abandoning, dropping, or leaving something behind, often in favor of something else.
Négliger
B2This verb describes the act of treating someone or something with carelessness or indifference. It implies that you are not giving enough attention to a task, a person, or your own appearance. It focuses on the poor quality of care or the act of unintentional oversight.
Si tu continues de négliger tes plantes, elles vont mourir.
(If you continue to neglect your plants, they will die.)
Le directeur a négligé de mentionner les risques financiers.
(The director neglected to mention the financial risks.)
Depuis qu'il est malade, il se néglige complètement.
(Since he has been sick, he has completely let himself go.)
Elle a négligé ses études pendant le dernier trimestre.
(She neglected her studies during the last term.)
Il ne faut pas négliger les petits détails dans ce projet.
(One must not overlook the small details in this project.)
Délaisser
C1This verb has a stronger sense of abandonment or withdrawal. It means to stop caring for, using, or visiting someone or something that you used to be involved with. It often suggests leaving something behind to focus on a new interest.
Les adolescents délaissent la télévision pour les réseaux sociaux.
(Teenagers are abandoning television for social networks.)
Il a délaissé sa famille pour se consacrer à sa carrière.
(He neglected his family to devote himself to his career.)
Cette vieille maison a été délaissée par ses propriétaires.
(This old house was abandoned by its owners.)
J'ai peur que mes amis me délaissent si je déménage.
(I am afraid my friends will forsake me if I move away.)
Elle a délaissé le piano pour apprendre la guitare.
(She gave up the piano to learn the guitar.)
Summary
In short, use négliger when talking about sloppiness, lack of maintenance, or insufficient attention (doing a bad job). Use délaisser when talking about abandonment, giving up on something, or switching your focus to something new (leaving it behind).