Minimal (adjective)

1. The smallest or least amount or quantity possible or acceptable.
2. Simple or basic and not involving anything extra or unnecessary.
3. Having only the bare necessities required for a particular purpose.

Origin:

Late latin minimalis 'smallest', from latin minimum 'smallest part, least', from minimus 'least', superlative of parvus 'small'.

Examples:

1. The room was decorated with a minimal approach to keep it looking simple.
2. She required a minimal amount of effort to complete the task.
3. He lived a minimal life with just the essentials.
4. The kitchen had minimal appliances and utensils.
5. The payment was a minimal amount, just enough to cover the expenses.