Justly vs Truthfully - What's the difference?

Justly is a related term of truthfully.

is that justly is in a just or fair manner; rightfully while truthfully is (manner) in a truthful manner.

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In a just or fair manner; rightfully.

* 1890 , Robert Franklin Pennell, History of Rome :

His valor, wisdom, and justice made him justly popular, but caused him to be regarded with suspicion at Rome.

With a just or fair use of language; with good reason, properly.

* 2012 , Jay Newton-Small, ‘Gangless in Glasgow’, Time , 1 Oct 2011:

But the city on the River Clyde can justly claim to have turned the tide.

(obsolete) With great precision; accurately, exactly.

*, II.14:

It is a pleasant imagination to conceive a spirit iustly ballanced betweene two equall desires.

(en adverb)

(manner) In a truthful manner

He spoke truthfully .

(speech act) Frankly.

Truthfully , I didn't suspect a thing.