sticky

having the properties of glue

moist as with undried perspiration and with clothing sticking to the body

• “felt sticky and chilly at the same time”

hot or warm and humid

• “muggy weather”
• “the steamy tropics”
• “sticky weather”

hard to deal with; especially causing pain or embarrassment

• “awkward (or embarrassing or difficult) moments in the discussion”
• “an awkward pause followed his remark”
• “a sticky question”
• “in the unenviable position of resorting to an act he had planned to save for the climax of the campaign”