By force is a phrase that indicates the use of physical coercion to achieve a desired outcome. However, the use of this expression can have negative connotations, conveying a sense of violence or aggression. Luckily, there are several synonyms available that can convey the same meaning in a milder or more diplomatic way. Some of these synonyms include "compulsory," "coercive," "mandatory," "imperative," "obligatory," "enforceable," "mandatory," and "compelling." Each term provides a slightly different emphasis, but all of them suggest that something must be done and that a certain level of pressure may be required to accomplish it.