His dark gaze was steady, his body rippling with the power she couldn't quite pin down.
coda consonant is used in any particular word, however, is difficult to pin down.
intentional under one description but not under another is itself hard to pin down.
Chrysanthemums: Available in a wide array of colors, these flowers are also hard to pin down when it comes to form, too.
Learning the rules of business casual is a challenge since it's difficult to pin down a one-size-fits-all business casual dress code.