Straitness is a term that describes a state or quality of being narrow, restricted, or limited. There are several synonyms that can be used to convey a similar meaning, such as narrowness, constrictions, tightness, restraint, compression, and confinement. These words are often used to describe physical spaces or objects that are small or restricted in size, or to depict situations that involve limited resources or options. Some other related synonyms include austerity, rigor, severity, and stringency, which are generally used to indicate strictness or harshness in rules or regulations. Overall, the use of synonyms is essential in enriching the English language and communicating effectively.