Synonyms of 'minimal'
minimumDictionary, smallest, least
effective defence with minimal expenditure
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You use the least to mean a smaller amount than anyone or anything else, or the smallest amount possible.
If you like cheese, go for the ones with the least fat.
A nominal price or sum of money is very small in comparison with the real cost or value of the thing that is being bought or sold.
The ferries carry bicycles for a nominal charge.
Thesaurus for minimal from the Collins English Thesaurus
Something that is minimal is very small in quantity, value, or degree .