陰湿[inshitsu] malicious
加湿[kashitsu] humidification
加湿機[kashitsuki] humidifier
乾湿[kanshitsu] degree of humidity
乾湿計[kanshitsukei] humidity meter

湿す[shimesu] to wet
湿り[shimeri] dampness
湿る[shimeru] to be wet
湿気[shikke] moisture
湿気る[shikeru] to be damp