thoroughly
adv.in a very careful and complete way so that nothing is forgotten. You use this when you want to say you did something from start to finish with great attention to detail.
adv.in a comprehensive and exhaustive manner; to the fullest extent possible. Often used to modify verbs of investigation, cleaning, or emotional states.
“She cleaned the kitchen thoroughly before the guests arrived.”
“The police searched the building thoroughly but found no evidence of a break-in.”
“Before signing the contract, the legal team reviewed every clause thoroughly to ensure there were no hidden liabilities that could jeopardize the merger.”
Typically placed after the verb or at the end of the clause; can also precede the main verb for emphasis.
While 'thoroughly' can precede the verb, it cannot sit between the subject and the verb if the sentence structure is disrupted; it most naturally follows the object.
From thorough + -ly.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.