Are the witches ugly in general? How they show themselves to the other characters?
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They are the stereotypical Elizabethan witches. They are ugly ,old and look like men. They personified what Elizabethan's felt was "evil".
Check out Banquo's take on them when he fist sees them,
By each at once her choppy finger laying
Upon her skinny lips. You should be women,
And yet your beards forbid me to interpret
That you are so.