G4087–πικραίνω–pikrainō

Husbands, love your wives, and be not bitter against them.

πικραίνεσθε pikrainesthe “do be harsh”

And the name of the star is called Wormwood: and the third part of the waters became wormwood; and many men died by the waters, because they were made bitter.

ἐπικράνθησαν. epikranthēsan “they were made bitter.”

And I went to the angel, and said to him, Give me the little book. And he said to me, Take it, and eat it, and it shall make thy belly bitter, but it shall be in thy mouth sweet as honey.

πικρανεῖ pikranei “it will make bitter”

And I took the little book out of the angel's hand, and ate it; and it was in my mouth sweet as honey: and as soon as I had eaten it my belly was bitter.

ἐπικράνθη epikranthē “was made bitter”