ratiocinates

Example:After drinking several cups of coffee, he began to ramble and couldn't stay on the subject.

Definition:to speak or think in a disconnected or incoherent way, as if parts of a thought or idea are being overlooked or forgotten; to wander irresolutely from place to place; to move without purpose or direction.

Example:The critic speculated about the meaning behind the painting but had no concrete proof.

Definition:to form an idea or draw a conclusion about something without having all the facts or evidence; to base something on conjecture, inference, or assumptions; to indulge in guessing or in forming conjectures.

Example:He continued to imitate the famous scientist's mannerisms without fully understanding the concepts.

Definition:to imitate or mimic; to copy; to follow or emulate.