Antonyms of adj well_thought_out

1 sense of well thought out

Sense 1
well thought out (predicate) -- (resulting from careful thought; "the paper was well thought out")

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

Similarity of adj well_thought_out

1 sense of well thought out

Sense 1
well thought out (predicate) -- (resulting from careful thought; "the paper was well thought out")
       => thoughtful (vs. thoughtless) -- (exhibiting or characterized by careful thought; "a thoughtful paper")