What is the opposite of deleterious?

Need antonyms for deleterious? Here's a list of opposite words from our thesaurus that you can use instead.

Opposite of harmful often in a subtle or unexpected way
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(of a person, attitude, or situation) Opposite of having a toxic or damaging influence
“When Clive took on a mentoring role, he became an immensely positive influence on my life.”
Opposite of evil or morally wrong
“Just as crimes were severely punished, statues of virtuous men publicly honored good deeds.”
(of a building or other structure) Opposite of falling or fallen into ruin
Opposite of characterized by or causing degeneration
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