Igneous and Sweltry

Igneous adjective - Produced by the action of fire or intense heat.

Sweltry and igneous are semantically related in hot topic. In some cases you can use "Sweltry" instead an adjective "Igneous", when it comes to topics like very high in temperature.

Sweltry adjective - Excessively hot and humid or marked by sweating and faintness.

Igneous and sweltry are semantically related in hot topic. Sometimes you can use "Igneous" instead an adjective "Sweltry", if it concerns topics such as very high in temperature.