Sentence:  For example , the importance of the Regulus 2 , , a <WSD>very</WSD> promising aerodynamic ship to surface missile designed to be launched by surfaced submarines , was greatly diminished by the successful acceleration of the much more advanced Polaris ballistic missile launched by submerged submarines . 
Meaning of the word marked with <WSD> tags:  used as intensifiers; `real' is sometimes used informally for `really'; `rattling' is informal