| Said like | Means |
|---|---|
| Flat, short | Okay / fine |
| Rising, surprised | Really? Is that so? |
| Slow, drawn out | Ohh, I see |
| Sharp, at the start of a sentence | Right then — anyway |
| Before a question | So tell me… |
| As an actual adjective | Good, nice |
अच्छा acha for a masculine noun, अच्छी achi for feminine, अच्छे ache for plural or respectful. Acha khana — good food. Achi kitaab — a good book.
As a conversational filler it never changes. It just stays acha.
It is the single most common word in spoken Hindi after the pronouns. Learners who use it start sounding natural months before their grammar deserves it, because it fills the gaps where an English speaker would say "okay… right… mm-hm".
The gendered version is your first meeting with grammatical gender, which touches every adjective and verb in the language. The guide to that is here.
Reading an answer is one thing; being corrected while you say it is another. EkGuru tutors teach one to one from $6 a lesson, and most offer a trial.