When it comes to finding synonyms for the word "less-powerful", there are plenty of options to choose from depending on the context of the sentence or phrase. Some possibilities include words such as weak, feeble, powerless, ineffective, inadequate, and ineffectual. Other synonyms may include terms like subordinate, lesser, underpowered, debilitated, diminished, and restrained. Depending on the exact meaning intended, other relevant synonyms may include descriptions such as minor, subordinate, or limited. Ultimately, choosing the right synonym will depend on the specific context of the phrase and what meaning the writer is trying to convey.