Sentence:  What you were looking for ( unless you make a hobby of collecting old tennis rackets and fly screens ) eludes me , but to judge from phonograph records scattered about a fumed oak Victrola , you danced two tangos and a paso doble , which must have been <WSD>fairly</WSD> enervating in that milieu . 
Meaning of the word marked with <WSD> tags:  to a moderately sufficient extent or degree