Not showing the effects of aging; timeless or eternal.

(a)  

Without a card, especially in contexts like banking where a card is usually

(a)  

Without a home; lacking a permanent place to live.

(a)  

Not affected by the passage of time or changes in fashion; eternal and enduring.

(a)  

Lacking compassion, empathy, or kindness; cruel or unfeeling.

(a)  

Without children; not having any children.

(a)  

In the art world, the value of a piece varies greatly. Some artworks are considered ​ (a)   due to their historical significance and uniqueness, making them impossible to purchase. Conversely, items that seem ​ (b)   to some hold sentimental value to others. Occasionally, artists offer ​ (c)   exhibitions, allowing the public to enjoy their creations for free. Whether an artwork is valuable or ​ (d)   often depends on the beholder's perspective.

Using or involving digital or electronic documents instead of paper.

(a)  

Lacking color; transparent or clear.

(a)  

Using radio waves instead of wires or cables to transmit signals, especially for communication or connectivity.

(a)