Sarcastically tells you how someone said something: they used sarcasm. The words on the page may look kind or calm — 'Sure, take your time' — but the speaker means the opposite, and wants you to feel that they are annoyed or making an unkind joke. In speech, the voice often goes flat, or too sweet, or heavier on one word. In writing, people sometimes add 'she said sarcastically' because otherwise the line can be read as honest. Friends may speak sarcastically in a teasing way; a boss or a stranger doing it can feel cold. It is an adverb, so it usually sits with a verb of speaking: said sarcastically, asked sarcastically, smiled sarcastically (the smile is doing the same job as the voice). Though actually, not every joke that says the opposite is cruel — but this word still leans toward the sharp side, not toward gentle humour.