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Producing the intended result; entirely adequate.
- Redoubling, then, the active energy of his thrusts, favoured by the fervid appetite of my motions, the soft oiled wards can no longer stand so effectual a picklock, but yield, and open him an entrance.
- In the living state, the body is observed to […] adopt most effectual measures for the permanent continuance of its species.
ant. ineffectual