Filter words are the quiet tax on amateur prose. They are grammatically fine, they feel natural to write, and they put a thin pane of glass between the reader and the story. Cutting them is one of the highest-leverage line edits there is — a fast pass that makes prose immediate instead of reported. This guide explains what filter words are, why they weaken writing, which ones to watch for, and how to find and cut them without going too far.
What filter words are
A filter word is a word that filters an experience through the character's perception instead of presenting the experience directly. They are usually verbs of sensing or thinking placed between the point-of-view character and what's happening: she saw the door open, he felt the cold, she realized she was alone.
Strip the filter and the same moment lands directly: the door opened, the cold bit through his coat, she was alone. The information is identical; the difference is distance. The filtered version keeps the camera on the character observing. The unfiltered version puts the reader inside the experience.
Why they weaken your prose
Filter words work against "show, don't tell," the most repeated rule in fiction, because they report an experience rather than render it. Every "she saw" and "he heard" reminds the reader that they're being told about a story rather than living in one. Used heavily, they also signal something worse: that the writer doesn't trust the reader to infer what's happening without being walked through it.
There's a practical cost too. Filter words are padding. A manuscript heavy with seemed, felt, noticed, and realized is a manuscript with hundreds of removable words and a muffled, second-hand quality — one of the tells that reads as flat or machine-generated.
The filter words to watch for
Most filter words fall into two groups.
Sensory verbs — the five senses reporting in: saw, see, look, watch, notice, hear, heard, listen, feel, felt, touch, taste, smell.
Cognitive verbs — the mind reporting in: realized, knew, thought, wondered, decided, remembered, noticed, seemed, looked like, felt like.
A few more hide in plain sight: began to and started to ("she began to run" → "she ran"), and was able to ("he was able to open it" → "he opened it"). These aren't filter words exactly, but they dilute action the same way.
How to find and cut them
The reliable tell is a pronoun followed by a sensory or cognitive verb: I saw, she heard, they felt, he realized. Search your manuscript for each word on the list and look at what follows. When the verb is filtering an experience, cut the filter and let the experience stand:
- She felt thick drops of rain pelt her bare neck. → Thick drops of rain pelted her bare neck.
- He watched her dance in the rain. → She danced in the rain.
- She realized the house was empty. → The house was empty.
Notice what each cut does: it removes the narrator-character standing between the reader and the moment, and it usually tightens the sentence by a few words. Do this across a chapter and the prose visibly sharpens.
When to keep a filter word
Filter words are not always wrong, and deleting every one mechanically will damage your prose. Keep a filter word when the act of perceiving is the point — when you want to emphasize that the character noticed something, or deliberately restrict the reader to what the character can sense, or when removing it creates confusion about whose viewpoint we're in. She heard footsteps behind her keeps the filter on purpose: the fear is in the hearing.
The goal is not zero filter words. It is removing the ones that add distance without adding meaning, and keeping the few that earn their place.
Catch them automatically
Filter words are the ideal thing to fix on a dedicated pass rather than while drafting — hunting them mid-sentence will strangle your momentum. Draft freely, then sweep for them later.
This is one of the passes Novelmint runs for you. Its editorial step strips filter words, repetition, and padding automatically — the same tics, alongside em-dash overuse and over-explaining, that make AI-assisted prose read as machine-written. You write the scene; the pass clears the glass between the reader and it, so the published chapter reads immediate and clean.