All 4 Uses

constrained
in
The Rainbow Trail
(Auto-generated)

"That fellow left—rather abruptly," said Shefford, constrainedly.†
Chpt 1 *

constrainedly = in a way that is restricted; or lacking in spontaneity
"I should—think so," replied Shefford, constrainedly.†
Chpt 11
A constrained silence was maintained around the camp-fire for a while.†
Chpt 12

constrained = restricted; or lacking spontaneity
Shefford laughed constrainedly.†
Chpt 16

constrainedly = in a way that is restricted; or lacking in spontaneity

Definitions:

(1) (constrained)
restricted or inhibited
(2) (meaning too rare to warrant focus)
Much more rarely (and archaically), constrain can mean to force someone to do something.