[perttime]

There's a couple of articles on wikipedia that might help:

https://en.wikipedia.org/wiki/Guitar...nics#Overtones
"When a guitar string is plucked normally, the ear tends to hear the fundamental frequency most prominently, but the overall sound is also colored by the presence of various overtones (integer multiples of the fundamental frequency). The fundamental frequency and its overtones are perceived by the listener as a single note; however, different combinations of overtones give rise to noticeably different overall tones (see timbre)"

https://en.wikipedia.org/wiki/Timbre
"timbre is what makes a particular musical sound have a different sound from another, even when they have the same pitch and loudness. For instance, it is the difference in sound between a guitar and a piano playing the same note at the same volume. Both instruments can sound equally tuned in relation to each other as they play the same note, and while playing at the same amplitude level each instrument will still sound distinctively with its own unique tone color. "

Some guitars have very prominent fundamental notes - which might be perceived as "clearly defined" or "boring". Other guitars may have more prominent overtones - which might be called "rich" or "cluttered", depending on what kind of sound you want.