Surely, 1) firmly: “that I may s. keep mine oath,” Shr. IV, 2, 36. “by this knot thou shalt so s. tie thy now unsured assurance to the crown,” John II, 470.
2) certainly, undoubtedly: “and s. as I live, I am a maid,” Ado V, 4, 64. “none are so s. caught,” LLL V, 2, 69. “he pays you as s. as your feet hit the ground,” Tw. III, 4, 305. “as s. as I live,” R2 IV, 102. “as s. as my soul intends to live . . . I do believe,” H6B III, 2, 153. Simply inserted by way of asseveration: “and s. it is a sleepy language,” Tp. II, 1, 210. “s. I think you have charms,” Wiv. II, 2, 107. Meas. I, 2, 175. III, 2, 137. IV, 2, 34. Err. IV, 4, 89. Err. IV, 4, 89 Ado II, 3, 180. III, 2, 103. IV, 1, 261. IV, 1, 261 IV, 1, 261 LLL I, 2, 92. As II, 2, 16. Shr. IV, 2, 65. All's III, 5, 58. H4B III, 2, 77. H5 III, 2, 126 (Captain Jamy: suerly). H6A IV, 6, 50. H6B III, 1, 77. V, 1, 216. H6C II, 6, 41. H8 I, 1, 57. II, 2, 124. III, 2, 356 “(full s.).” V, 4, 62. Troil. III, 2, 138. Tim. III, 4, 32. IV, 3, 500. Hml. III, 2, 351 (Ff freely). Oth. I, 1, 158. II, 3, 244. Cymb. V, 5, 92.