a
archaic
: without care : trustingly
devise not evil against thy neighbor seeing he dwelleth securely by thee—Proverbs 3:29 (Authorized Version)
b
: with assurance : safely
she was securely happy—Ellen Glasgow it may securely be denied—Hilaire Belloc
c
: without question : certainly
the shadows of poverty … had been securely dispelled—Osbert Sitwell
d
: firmly
securely clamped in place authority … securely established—B. K. Sandwell
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Merriam-Webster unabridged