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Webster 1913 Edition

Adj.

Insuppressible.

[Obs.]

“The insuppressive mettle of our spirits.”

Shak.

Adj.

Not to be suppressed.

insuppressive ‎(comparative more insuppressive, superlative most insuppressive)

(obsolete) insuppressible; that cannot be suppressed
The insuppressive mettle of our spirits. — Shakespeare.