Is "literally" similar to "almost", and is "technically" similar to "hardly"? [closed]

Yes to the first.

"Literally" in this sense means "Virtually", " Almost"-- so you could use the words interchangeably without a significant shift in meaning.

NO to the second.

In fact, you are suggesting just the opposite. In other words, "tomato is technically a fruit" means strictly speaking, it is a fruit and not a vegetable-- that is, botanically speaking, it satisfies the criteria of a fruit more than it does of a vegetable. But since it is more often cooked or taken as a vegetable, it isn't called a fruit.

No. Technically, in the contexts of this kind, means in accordance with the technical terminology of the relevant field, as opposed to the casual, everyday usage. A tomato is a fruit if one uses the word fruit in accordance with the terminology of botany, but it would be a wrong thing to say in casual conversation, because the everyday sense of the word is different (it is limited to what is typically eaten in desserts). One can express that by saying that, technically, a tomato is a fruit.

A botanist would not say that a tomato is hardly a fruit: if one uses the word fruit in the technical sense that it has in botany, then a tomato is most definitely a fruit. On the other hand, if one uses the word fruit in the everyday sense, then a tomato just isn't a fruit. If you tell somebody 'Please bring me some fruit from the larder', and the person came back with tomatoes, that would be a mistake.

(This answer does not address literally, because a search for that word on this site will readily lead to a number of pages on which the matter is addressed extensively.)