latent C1

/ˈleɪ.tənt/ potentially existing but not presently evident or realized

lethargy C1

/ˈlɛθ.ə(ɹ).d͡ʒi/ A state of extreme torpor, sopor or apathy, especially with lack of emotion, energy or enthusiasm; (loosely) sluggishness, laziness.

lamentation C2

/ˌlæm.ənˈteɪ.ʃən/ The act of lamenting.