Antonyms of adj deep_in_thought

1 sense of deep in thought

Sense 1
bemused, deep in thought (predicate), lost (predicate), preoccupied -- (deeply absorbed in thought; "as distant and bemused as a professor listening to the prattling of his freshman class"; "lost in thought"; "a preoccupied frown")

INDIRECT (VIA thoughtful) -> thoughtless -- (showing lack of careful thought; "the debate turned into thoughtless bickering")

Similarity of adj deep_in_thought

1 sense of deep in thought

Sense 1
bemused, deep in thought (predicate), lost (predicate), preoccupied -- (deeply absorbed in thought; "as distant and bemused as a professor listening to the prattling of his freshman class"; "lost in thought"; "a preoccupied frown")
       => thoughtful (vs. thoughtless) -- (exhibiting or characterized by careful thought; "a thoughtful paper")