The phrase "erratic thought" is correct and usable in written English.
It can be used to describe a thought process that is unpredictable or inconsistent.
Example: "His erratic thought patterns made it difficult for him to focus on the task at hand."
Alternatives: "unpredictable thinking" or "inconsistent thoughts."
His speech became rapid and littered with erratic thoughts within months.
Desperation leads a patient to erratic thoughts of flying across the county to see any renowned doctor who could possibly provide some relief.
Musical purists sometimes found fault with the group, which played in a loose-jointed style that some thought erratic.
She told him he wrote better letters than Henry James (which was sometimes true) and that his prose reminded her of Turgenev; he, entranced by the sparkle and erratic flight of her thoughts, thought she outranked Virginia Woolf as a correspondent.
For example, we are in dis-harmony if our physical body is in good shape yet our thoughts are erratic and disturbed, or when we think we have balanced thoughts yet our emotional selves are distressed.
It did not end up that score, however, because the finishing of the 37 shots on goal was erratic, with passion overrunning thought, as it did on so many things this night.
Announced two years ago, the series was received with some skepticism among booksellers, in reaction to the erratic sales of the Library of Contemporary Thought, a series of similarly short books, also by well-known authors, published in paperback by Ballantine at the rate of one a month.
They can appreciate one another's erratic and perplexing trains of thought.
These traits – erratic behaviour, excessive restlessness, racing thoughts – lead to this eventual diagnosis of bipolar, which he had by that point been living with for a decade.
And in any case the play's thought-generating themes — the erratic, mysterious nature of memory and the question of how definitively the past shapes present behavior — do not admit easy elucidation.
