verb

comentar

comment on · comment

Dar una opinión o hacer una observación sobre algo que se ha dicho, visto o hecho.

Comentar is a Spanish verb that means "to comment" or "to discuss."

Meaning:

To express an opinion or make remarks about something, such as a text, situation, or event. For example:
Voy a comentar el artículo que leí.
(I am going to comment on the article I read.)
To explain or clarify something in detail, often to make it easier to understand. This can apply to academic or literary contexts where a person elaborates on the meaning or implications.
El profesor comentó cada párrafo del libro.
(The teacher explained each paragraph of the book.)

Parts:

It is a regular -ar verb.
Conjugates regularly following the patterns of verbs ending in -ar (yo comento, tú comentas, él comenta, etc.).

Synonyms:

Expresar (to express)
Opinar (to give an opinion)
Argumentar (to argue or make a point)
Analizar (to analyze, in the context of discussing or explaining)

Antonyms:

Since "comentar" implies giving input or discussing, antonyms would relate to silence or withholding opinion, such as:

Callar (to be silent)
Guardar silencio (to keep silent)

In summary, comentar is principally used when someone reviews, discusses, or gives their opinion on something, either informally or in an academic context.