General Synonyms:
* Friendly
* Cordial
* Harmonious
* Pleasant
* Civil
* Congenial
* Neighborly
* Agreeable
* Peaceable
* Kind
* Gentle
More Formal Synonyms:
* Diplomatic
* Courteous
* Gracious
* Conciliatory
* Reconciliatory
Synonyms for "amicable settlement":
* Compromise
* Reconciliation
* Agreement
* Accord
* Understanding
The best synonym for "amicable" will depend on the specific situation and the tone you want to convey.