first of all
2 antonyms for first of all — opposites grouped by meaning.
Adverb — Before anything else; used to introduce the first item in a list of points, steps or objections.
Antonyms
How to use first of all
The word patterns that sound natural to a native speaker.
Neutral to informal. In speech it often signals mild indignation before a rebuttal ("First of all, how dare you"). Formal writing prefers firstly or first.