Crossword puzzle clue "a matter of considerable difficulty"

Here are the possible solutions for a matter of considerable difficulty clue

Answer
Clue
Relevancy
task
Clue
A matter of considerable difficulty.
age
Clue
"___ is an issue of mind over matter.If you don't mind, it doesn't matter." (Mark Twain)
Definition
to grow old
idea
Clue
Matter for the gray matter
Gray matter matter?
Gray matter matter
Definition
a conception or a plan
makeamentalnote
Clue
Put some matter in the gray matter?
able
Clue
Having considerable skill
Definition
competent, also HABLE
aeon
Clue
Considerable age
Definition
the largest division of geological time, composed of several eras, also EON

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