I think it comes from the latin word for friend or the like which was 'amicus' (though the I should have a long mark on!)
"Ami" part of amicus is the root but really the entire word is the root. Here is an example: amiable being the root word with the suffix ally - amiably
(amiably means in a friendly or agreeable manner)"Each Labor Day, the residents amiably welcome swarms of tourists to their town.""The scientists were cautioned to act amiably toward the island's natives, who were once headhunters.""On seeing that my wife was in labor, the policeman put away his ticket book and amiably offered to escort us to the hospital."
"The townspeople responded amiably, offering overnight accommodations to the stranded bus passengers." "Sheriff Taylor always treated Otis, the town drunk, amiably and politely." "The young lion cubs were amiably curious, and investigated the passing turtle."
The adverb form amiably means in a pleasant, friendly, or agreeable manner.
Anybody who wants to. Like this:John was amiably walking in the park when he saw a quirky squirrel.
Friendly, sociable, affiable, kind, good-natured, and agreeable all work as synonyms for amiably.
Fugitive has no root word it is the root word.
There is no root word of river. It itself is a root word.
Lemony Tities
the root word is'confirminglyishness'
Root word is usual.
the root word is decor and that is the root word of decorate