Learn Hardcore Russian: Этот телефон совершенно новый и удобный. - This phone is completely new and comfortable.

совершенно is an adverb meaning “completely” or “absolutely.” It intensifies the adjective новый, so совершенно новый means “brand-new,” emphasizing that it’s totally unused.

Why is совершенно used instead of очень?

While очень simply means “very,” совершенно adds the sense of “entirely” or “perfectly.” So очень новый would be odd (you can’t be “very new”); instead you say совершенно новый to mean “absolutely new.”

Why are новый and удобный in their full forms rather than short forms?

Because they are attributive adjectives modifying телефон directly in the nominative case. Short-form adjectives (нов, удобен) are used predicatively after a linking verb or in certain stylistic contexts, but here we describe the noun: новый телефон, удобный телефон.

How do новый and удобный agree with телефон?

Телефон is masculine, singular, and in the nominative case. Therefore both adjectives take the masculine-singular-nominative ending -ый: новый, удобный.

Why is удобный used instead of удобно?

Удобно is an adverb meaning “in a comfortable way.” Удобный is an adjective meaning “comfortable.” Since we describe the noun телефон, we need the adjective удобный, not the adverb удобно.

Can we swap the order of the adjectives or omit и?

Yes, you could say Этот телефон совершенно новый, удобный or Этот телефон удобный и совершенно новый, though the original order is the most natural. Omitting и and just using a comma is also acceptable in listing adjectives.

What is the role of Этот at the beginning?

Этот is a demonstrative pronoun meaning “this.” It specifies which phone you’re talking about: “This phone is brand-new and comfortable.” Without Этот, you’d say Телефон совершенно новый и удобный, which is more general.