The phrase "hits unexpectedly" implies an event that catches one by surprise. Synonyms for this phrase include "blindside," "catch off guard," and "ambush." Each word connotes a different level of impact; "blindside" and "ambush" both imply an attack or assault, while "catch off guard" is less aggressive and suggests a situation that takes one by surprise. Other synonyms include "surprise attack," "catch unawares," and "unexpected assault." The use of any of these phrases can convey a sense of suddenness or shock that may be useful for writers looking to create an impactful scene or dramatic moment in their writing.