lets down (verb) let down: disappoint
Sinonime: absent,
absorbed, abstracted, airheaded, airheaded,
bemused, careless, daydreaming,
distracted, distrait, dreaming,
dreamy,
engrossed, faraway, forgetful, goofing off, head in the clouds, heedless, inattentive, inconscient,
lost, mooning, moony, oblivious, out to lunch, pipe dreaming,
preoccupied,
remote,
removed, scatterbrained, space cadet, spacey, spacey,
surroundings, unaware of events, unconscious, unheeding, unmindful, unobservant, unthinking,
withdrawn, woolgathering
Antonime: alert, attentive, aware