Use "guileful" in a sentence

1. 14 Guileful and ruthless, he was a generous and steadfast friend.

2. Synonyms for Conniving include calculating, colluding, designing, plotting, scheming, artful, cunning, guileful, tricky and wily

3. Yet doubt is guileful, on secret paths it sneaks around a person, and when faith is expecting victory, doubt whispers that this expectancy is a deception.