thin

Overly sensitive to criticism; quick to take offence; irritable; touchy.

Immediately and inexplicably out of sight.

Dangerously, hazardously, delicately.

From nowhere or nothing; from a non-existent or unknown source.

Very thin, unhealthily thin.

To be (or to place oneself) in a risky, potentially dangerous or delicate situation.

To commit oneself to too many projects, so that there is little chance of completing them all satisfactorily.

Both thickets and thin woodland; all obstacles in a path (including bad weather).

An unknown location; (by extension) apparent disappearance or nonexistence.

To become or make (something) thinner or smaller (in overall size, width or viscosity).

Something that if allowed or accepted to a small degree would lead to systematic encroachment.

To make sparse; to remove some of a group of newly-planted plants in order to allow the remaining ones to grow unimpeded.

to cull, to reduce the size of a group

To become or make (something) thin (in either width or viscosity).

Through all (especially grim, rough and difficult) conditions; in all weathers.

To lessen or weaken over time, as from overuse.