Definitions in relation to their use in these kangaroo words, taken from Google Dictionary, and edited for formatting.
Kangaroo word: prudent
Joey word: rude
prudent (adjective): acting with or showing care and thought for the future.
rude (adjective): offensively impolite or ill-mannered.
The letters R, U, D, and E found within the anti-kangaroo word “prudent” arrange in the listed order to complete the joey word “rude”. While a word can have multiple definitions, in relation to their use with kangaroo words, these two words share an opposite meaning: thoughtful vs. thoughtless.