For example, a person's destiny is fixed/set from birth.

Don't suppose 決定 is the word?
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2018-03-17T04:14:32.520
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question
word-requests
How do you say 'set 'or 'fixed' for this example
guess it depends on sentences. if you wanna say 'a person's destiny is fixed/
set from birth.' in Japanese 「人の運命は決まっている」, as such 決まっている is the way you
would take, but don't ask me why it is present progressive form of the verb
決まる.

a verb 決定する means 'deside/ make a decision', hence it don't seem to quite fit
the sentence above.

of course there is some words we convey the meaning of 'set/fixed'. for
instance, 固定する means 'fix/ set', which is basically used when some sort of
smaller parts are physically attached to something bigger part as in 屋根を固定する
in Japanese.

check out here.
<https://thesaurus.weblio.jp/content/%E6%B1%BA%E5%AE%9A%E3%81%99%E3%82%8B>
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answer