constant (adj.) 1
faithful, steadfast, true
Cor I.i.237 [Martius to Cominius] I am constant [i.e. keep my word]
Cor [Cominius to Brutus] All the regions / Do smilingly revolt, and who resists ... perish constant fools
Cym I.v.57 [Frenchman to Iachimo, of a lady] to be more ... constant
H8 III.i.134 [Queen Katherine to Campeius and Wolsey] Bring me a constant woman to her husband
TG V.iv.112 [Proteus to Julia] were man / But constant, he were perfect!