The term 'not windy' can be described by three crossword solutions: terseness (5 letters), CALM (4 letters) and UNRESPONSIVE (12 letters). Terseness is a quality of being brief and to the point, often in an abrupt manner. CALM is a state of tranquility and peace, free from agitation or disturbance. UNRESPONSIVE is a lack of reaction or response to something. Together, these three words describe a situation that is not windy, meaning it is still, quiet and not affected by gusts of air.