Erratic

Simple meaning

Erratic means irregular and unpredictable — following no clear pattern, moving in unexpected directions, hard to rely on.

Detailed meaning

Erratic comes from the Latin errare — to wander, to go astray (the same root as error). Something erratic wanders without direction — inconsistent, unpatterned, unreliable.

It can describe:

• Behaviour — erratic behaviour means acting in inconsistent, unpredictable ways
• Performance — erratic results means good sometimes, bad other times, with no clear reason
• Physical movement — erratic driving means weaving, unpredictable, dangerous
• Conditions — erratic weather means it changes without pattern

The key quality of erratic is inconsistency — not just sometimes bad, but unpredictably variable. You can't tell what you'll get next.

Where to use it

It works well in:

• Describing inconsistent behaviour — "erratic mood", "erratic schedule"
• Evaluating performance — "erratic quality", "erratic attendance"
• Describing conditions — "erratic supply chain", "erratic weather patterns"

Where not to use it

Erratic means unpredictably variable — not just consistently bad or gradually declining.

5 example sentences

1. His attendance was erratic — present three days, gone two, never with much notice.
2. The stock was erratic, swinging up and down by 5% within a single trading day.
3. She had an erratic sleep schedule — sometimes in bed by 9 pm, sometimes awake until 3 am.
4. The power supply in the old building was erratic — lights flickering, equipment cutting out randomly.
5. Erratic rainfall is one of the most difficult conditions for farmers — too much one month, drought the next.

Similar & opposite words

Similar (synonyms)

Opposite (antonyms)

Shade of difference: Volatile implies dramatic, rapid changes — often with high energy. Erratic is calmer in tone but equally unpredictable — the pattern is simply absent. Inconsistent is the plain English version. Capricious adds a human quality — changing on a whim.

Memory trick

Summary

Erratic means irregular and unpredictable — no consistent pattern, no reliable direction. It applies to behaviour, performance, conditions, and movement. When something is erratic, you cannot plan around it — which is exactly what makes it difficult to manage. Naming it precisely is the first step to addressing it.