Examples:
the
formidable
prospect
of
major
surgery
a
tougher
and
more
redoubtable
adversary
than
the
heel-clicking,
jackbooted
fanatic
something
unnerving
and
prisonlike
about
high
grey
wall
redoubtable (English)
└── redoutable (French)
├── -able (French)
└── redouter (French)
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