Equal
The Same, Equivalent, Similar
い adjective
This is a single kanji with an い on the end, meaning you know it's probably an adjective. What's the adjective form of equal? It's equal (and also similar or equivalent). That "similar" one is a bit weird, because "similar" is not equal, though I'd lean more towards equal.
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you: What should be equal above all things? I think each person (ひと) should be equal!
それは、ほぼやってないに等しいんじゃない？
That's almost as if you didn't do it.
オタクだけではなく他の人にとっても、ネット上で大文字を使うことは大声を出すことに等しいですよ。
Even for people who aren’t nerds, using uppercase letters on the internet is equivalent to shouting.
左の金玉と右の金玉の重さって等しいと思いますか？
Do you think the left and right balls are equal in weight?