Antonyms of adj ill-considered

1 sense of ill-considered

Sense 1
ill-considered, ill-judged, improvident, shortsighted -- (not given careful consideration; "ill-considered actions often result in disaster"; "an ill-judged attempt")

INDIRECT (VIA imprudent) -> prudent -- (careful and sensible; marked by sound judgment; "a prudent manager"; "prudent rulers"; "prudent hesitation"; "more prudent to hide than to fight")

Similarity of adj ill-considered

1 sense of ill-considered

Sense 1
ill-considered, ill-judged, improvident, shortsighted -- (not given careful consideration; "ill-considered actions often result in disaster"; "an ill-judged attempt")
       => imprudent (vs. prudent) -- (not prudent or wise; "very imprudent of her mother to encourage her in such silly romantic ideas"; "would be imprudent for a noneconomist to talk about the details of economic policy"- A.M.Schlesinger)