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in the PONS Dictionary

con·strained [kənˈstreɪnd] ADJ

1. constrained (compelled):

to feel constrained to do sth
don't feel constrained to do what he says

2. constrained (stiff):

constrained
constrained
constrained laugh

ˈcar·bon-con·strain·ed ADJ attr

carbon-constrained

con·strain [kənˈstreɪn] VB trans

1. constrain (restrict):

2. constrain (compel):

3. constrain liter (imprison):

Present
Iconstrain
youconstrain
he/she/itconstrains
weconstrain
youconstrain
theyconstrain
Past
Iconstrained
youconstrained
he/she/itconstrained
weconstrained
youconstrained
theyconstrained
Present Perfect
Ihaveconstrained
youhaveconstrained
he/she/ithasconstrained
wehaveconstrained
youhaveconstrained
theyhaveconstrained
Past Perfect
Ihadconstrained
youhadconstrained
he/she/ithadconstrained
wehadconstrained
youhadconstrained
theyhadconstrained