きっと and かな used in a sentence


I am listening to a song and came across もう充分だよって **きっと** 言う **かな**

Is it possible to use かな and きっと in a sentence? It sounds like "you will
**maybe definitely** say [it's already more than enough]", which doesn't
really make sense




The nuance of this きっと言うかな is somewhere between "I believe he will say" or "I
guess he will say".

The meaning of きっと is close to "I believe" rather than "definitely". It's a
relatively _subjective_ expression and the statement does not have to be based
on an evidence. Using "definitely" to translate きっと is too strong in many
cases.

かな is both "I wonder/doubt" and "I guess", depending on the context and the
intonation. For example, できるかな can sound like "I doubt I can do it", "I wonder
if I can do it" or "I guess I can do it". It's usually easy to tell the
meaning when you hear it, but it's difficult to describe the pronunciation
difference in text form... Anyway, in this context this かな is more like "I
guess" because it's used with きっと.

