แน่(nâe)

certain; definite

sure; not in doubt (often in fixed forms like แน่ใจแน่ใจnâe jai1sure; certain2[to] be sure (about/of), while แน่นอนแน่นอนnâe non1certain; sure2definite; fixed3certainly; definitely4[!] of course; certainly is more common for ‘certain’ as a predicate)

surely; certainly; for sure

used to emphasize that something is true or will happen (เช่นเช่นchên1for example; such as2like; such as (formal) ไปแน่, ได้แน่)

in trouble for sure; doom is certain

used in expressions to signal an inevitable bad outcome (เช่นเช่นchên1for example; such as2like; such as (formal) แย่แน่, ตายแน่ตายแน่dtaai nâae[!] I'm/you're/we're doomed; dead meat)

firm; steady; secure

physically fixed, steady, or not loose (formal/literary; everyday speech prefers แน่นแน่นnâen1tight; secure; firm2crowded; packed3constipated; bloated; chest-tight4solid; reliable; certain (figurative) for physical tightness)