IPA: /ˈkæpʃəsli/
KK: /ˈkæpʃəsli/
In a way that is likely to find fault or criticize, often unnecessarily.
She spoke captiously, pointing out every small mistake in the report.
Captiously → It is formed from "captious" (from Latin "captiosus", meaning deceitful or fallacious) and the suffix "-ly" (meaning in a manner of). The word "captiously" means in a manner that is inclined to find fault or raise petty objections.
Think of someone being 'deceitful' or 'fallacious' ('captious') when they criticize, and the '-ly' indicates the manner of that criticism.