"Monobrow" means "one eye-brow serving both sides of the face", but to
me has a suggestion of low intelligence or a coarse nature if anything
(probably unfairly). "High-brow" means "intellectual or of high
intelligence" but has nothing to do with eye-brows; it refers either to
a receding hair-line or a tall forehead. "Low-brow" is merely the
opposite of "high-brow". None of them has anything to do with dominant
personality.
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-- ^^^^^^^^^^
-- Whiskers
-- ~~~~~~~~~~