Kangaroo word: truthfully
Joey word: truly
Definitions in relation to their use in kangaroo words, taken from Google Dictionary, and edited for formatting.
The letters T, R, U, L, and Y found within the kangaroo word “truthfully” arrange in the listed order to complete the joey word “truly”. While a word can have multiple definitions, in relation to their use with kangaroo words, these two words share a similar meaning: honestly.