What is the opposite of groundless?

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

Opposite of without any grounds to support it
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Opposite of ineffective or useless
“The primary goal of advertising is to tap into the perceived collective desires of consumers in order to construct an effective ad campaign.”
Opposite of wrong or unjust
Opposite of having a tendency to inflict suffering and pain on others
Opposite of coarse, vulgar or abusive in nature
Opposite of arbitrary in nature
“He does his best to combat stereotyping and present a balanced, analytical account.”
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