Presumably: Definition, Usage & Common Mistakes

Meaning 1：very likely (presumably)

presumably 🔊

/prɪˈzjuːməbli/

adv.

It means 'very likely' or 'probably,' when you're making a guess based on what you know.

Person thinking presumably about someone asleep behind a closed door

very likely 🔊

➕

/ˈveri ˈlaɪkli/

adv.

Used to convey that something is very likely the case, based on known facts or reasonable assumption, often in formal or written contexts.

📁 Category：Behaviors & Actions 🔖 Level：Intermediate

📘 Details & Usage

📖 Root Explanation

From 'presume' (assume) + suffix '-ably'. 'Presume' itself comes from Latin 'praesumere', meaning 'to take before'.

💡 Mnemonic

Think of the word parts: pre- (before) + sume (as in 'assume' or 'take') + ably. So, you are 'able to take a guess beforehand'—presumably.

📖 Example

I haven't seen my roommate all morning, and his door is closed. Presumably, he's still sleeping. 🔊 I haven't seen my roommate all morning, and his door is closed. Presumably, he's still sleeping.

🔗 Collocations

be presumably true – Be assumed or very likely to be correct.

presumably based on – Very likely derived from or founded upon a certain premise.

presumably because – Most likely for the reason that.

🔄 Synonyms

probably (adv.) – Most likely; with considerable certainty. It is more common and less formal than presumably.

likely (adv.) – In all probability; with a strong chance of being true or happening.

in all probability (phrase) – Formal phrase meaning it is almost certain.

🚫 Antonyms

improbably (adv.) – In a manner not likely to be true or to happen.

unlikely (adj./adv.) – Not probable; having little chance of being the case or coming about.

🌱 Derivatives

presume (v.) – To suppose that something is true based on probability.

presumable (adj.) – Capable of being presumed or supposed.

presumption (n.) – An act or instance of presuming; a belief based on reasonable evidence.

📖 Cultural Story

Originating in the 16th century, 'presumably' combines the verb 'presume' (from Latin via French, meaning to take beforehand) with the adverbial suffix '-ably'. It reflects the formal, logical process of reaching a conclusion based on probability rather than certainty, making it a staple in academic, legal, and formal written discourse.