Source : Webster's Revised Unabridged Dictionary (1913)

Snugly \Snug"ly\, adv.
   In a snug manner; closely; safely.

Source : WordNet®

snugly
     adv 1: fitting closely; "the vest fit snugly"
     2: safely protected; "concealed snugly in his hideout"
     3: warmly and comfortably sheltered; "sittly snugly by the
        fireside while the storm raged"