What is the difference between an action line and a parenthetical?

An action line (or description) is full-width text describing what we see and hear in the scene. A parenthetical is a short note in parentheses under a character cue that qualifies how a specific line of dialogue is delivered or a small action taken while speaking.

When should you use a parenthetical?

Use a parenthetical only when the delivery isn't obvious from context and getting it wrong would change the meaning — for example (sarcastic) on a line that reads as sincere. If an actor could infer it, cut it.

What is a wryly in screenwriting?

'Wryly' is slang for a parenthetical, named after the overuse of the word 'wryly' as a delivery note. Overusing wrylies is considered a sign of an inexperienced writer because it tells actors how to act instead of trusting the dialogue.

Action Lines vs. Parentheticals: Avoid This Common Rookie Mistake

Confusing action lines and parentheticals is a dead giveaway of an amateur script. Learn what each is for, when to use them, and how to stop overusing wrylies.

Two of the most misused elements in a screenplay are the action line and the parenthetical. New writers reach for parentheticals to do work that belongs in action — or dialogue — and the result reads as amateur. Here's the clean distinction and the rule that keeps you out of trouble.

The core difference

Action line — full-width description of what the audience sees and hears. It lives between dialogue blocks and carries the visual story.
Parenthetical — a short note in parentheses, indented under a character cue, qualifying how the very next line is delivered, or a tiny action taken while speaking.

Sarah slams the laptop shut and stares out the window.   ← action line

                    SARAH
                (quietly)                                ← parenthetical
          I'm done.

The action line describes the scene. The parenthetical modifies one specific spoken line.

When to use a parenthetical

Sparingly. The valid uses:

Non-obvious delivery — the line reads sincere but must be sarcastic: (sarcastic).
Who's being addressed — in a group, (to Daniel) clarifies the target.
A small action mid-line — (lighting a cigarette) when it happens during the speech.

If the scene already makes the delivery obvious, cut the parenthetical. Trust the dialogue and the actor.

The rookie mistakes

Directing the actor. (angrily) on a line that's obviously furious is redundant — and it reads as not trusting your own writing. This is the "wrylies" problem.
Hiding action in parentheses. A real beat of action — someone crossing the room, drawing a gun — belongs in an action line, not a parenthetical. Parentheticals are for small gestures tied to the line.
Stacking long parentheticals. If it runs more than a few words, it's probably action.

A simple test

Ask: Is this about how one line is spoken, or is it something the audience sees happen?

How a line is spoken → parenthetical (if non-obvious).
Something we see → action line.

Keep the formatting automatic

Both elements have exact indentation, and you shouldn't be setting it by hand. A screenwriting tool applies the action and parenthetical styles automatically as you write — freeing you to focus on the real question, which is whether the parenthetical earns its place at all. That's part of how Scriptease handles formatting.

For related rules, see dual dialogue and the complete screenplay format guide.