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Webster 1913 Edition

adv.

By constraint or compulsion; in a constrained manner.

Hooker.

adv.

By constraint; by compulsion.

constrainedly ‎(comparative more constrainedly, superlative most constrainedly)

in a constrained manner, showing constraint
- 1903, Carter Goodloe, Calvert of Strathore:
  As his glance met that of Mr. Calvert, he bowed constrainedly, and the red of his face deepened.