There are event you can predict on that even though it's not 💯 guaranteed that you're going to win, a level of certainty makes you think that you're surely going to win.
The downside of that feeling is that you might become over confident to use a big amount in the game since you're to a large extent certain that you're going to win.
Can we still say we are gambling if the event is something we are at least 90% sure that we are going to win?
Be careful taking this point of view as betting is absolute. It's not like owning a stock, where you can buy at $100 and watch it slide down to $90, but you can then cash out if you decide the risk is not for you. If you place a $100 bet on something like 1.1x multiplier, which the bookmaker has priced with the idea that it's got a good chance to win, then you make only 10% profit but if you lose it'll wipe your bet out entirely. For me, that possibility of a 10% increase is still extremely high risk. I've actually lost three bets in very quick succession that were priced around 1.03x, so even those bets that look extremely safe can fall through and cause you a big downside. A 90% chance of winning does not sound so good in that context.