+4, ally
+3, warmly
+2, kindly
+1, amiably
0, indifferently
-1, apprehensively
-2, dubiously
-3, threateningly
-4, ready to attack

The /con message varies depending upon your level.  It changes depending upon your level.

        Character Levels 1 - 6

-4 and below Green - looks like a reasonably safe opponent
-1 to -3 Blue - looks like you would have the upper hand
even Black/White - looks like an even fight
+1 and +2 Yellow - looks like quite a gamble
+3 and up Red - what would you like your tombstone to say?

        Character Levels 7 - 12

-4 and below Green - looks like a reasonably safe opponent
-1 to -3 Blue - looks kind of risky, but you might win
even Black/White - looks kind of risky..you might win
+1 and +2 Yellow - looks like quite a gamble
+3 and up Red - what would you like your tombstone to say?

        Character Levels 13 - 14

-6 and below Green - looks like a reasonably safe opponent
-4 and -5 Blue - looks like you would have the upper hand
-1 to -3 Blue - looks kind of risky, but you might win
even Black/White - looks kind of risky..you might win
+1 and +2 Yellow - looks like quite a gamble
+3 and up Red - what would you like your tombstone to say?

        Character Levels 15 - 24

-6 or less, Green, looks like a reasonably safe opponent
-5, Blue, You would probably win this fight .. it's not certain though
-4, Blue, looks quite risky, but might be worth a try
-3, Blue, looks quit risky
-2 and -1, Blue, looks kind of dangerous
same, Black/White, he appears to be quite formidable.
+1 and +2, Yellow, looks like quite a gamble
+3 or more, Red, what would you like your tombstone to say

    Character Levels 25 - 34

-11 or more, Green, you could probably win this fight.
-8 to -10, Green, this creature could pose problems, you would probably defeat it.
-1 to -7, Blue, appears to be quite formidable.
same, Black/White, looks like quite a gamble.
+1 and +2, Yellow, looks like it would wipe the floor with you!
+3 or more, Red, what would you like your tombstone to say

    Character Levels 35 - 40

-11 or more, Green, you could probably win this fight.
-10, Green, this creature could pose problems, you would probably defeat it.
-1 to -9, Blue, appears to be quite formidable.
same, Black/White, looks like quite a gamble.
+1 and +2, Yellow, looks like it would wipe the floor with you!
+3 or more, Red, what would you like your tombstone to say

Character levels 41 - 44?

-12 or more, Green, you could probably win this fight.
-1 to -11, Blue, appears to be quite formidable.
same, Black/White, looks like quite a gamble.
+1 and +2, Yellow, looks like it would wipe the floor with you!
+3 or more, Red, what would you like your tombstone to say

Character levels 45 - 48

-13 or more, Green, you could probably win this fight.
-1 to -12, Blue, appears to be quite formidable.
same, Black/White, looks like quite a gamble.
+1 and +2, Yellow, looks like it would wipe the floor with you!
+3 or more, Red, what would you like your tombstone to say

Character Level 49 - 50

-14 or more, Green, you could probably win this fight.
-1 to -13, Blue, appears to be quite formidable
same, white/black, looks like quite a gamble.
+1 and +2, Yellow, looks like it would wipe the floor with you!
+3 or more, Red, what would you like your tombstone to say?
 

I still need information on levels above 50