focus

As an adjective indefatigable

is extremely persistent and untiring.

As a noun focus is

(countable|optics) a point at which reflected or refracted rays of light converge.

As a verb focus is

to cause (rays of light, etc) to converge at a single point.

As verbs the difference between seek and focus

is that seek is (lb) to try to find, to look for, to search while focus is to cause (rays of light, etc) to converge at a single point.

As a noun focus is

(countable|optics) a point at which reflected or refracted rays of light converge.

In transitive terms the difference between focus and settle

is that focus is to adjust (a lens, an optical instrument) in order to position an image with respect to the focal plane while settle is to colonize; to move people to (a land or territory).

In intransitive terms the difference between focus and settle

is that focus is to concentrate one’s attention while settle is to adjust differences or accounts; to come to an agreement.

As an adjective attentive

is paying attention; noticing, watching, listening, or attending closely.

As a noun focus is

a point at which reflected or refracted rays of light converge.

As a verb focus is

to cause (rays of light, etc) to converge at a single point.

As verbs the difference between specialise and focus

is that specialise is while focus is to cause (rays of light, etc) to converge at a single point.

As a noun focus is

(countable|optics) a point at which reflected or refracted rays of light converge.

In transitive terms the difference between focus and glimpse

is that focus is to adjust (a lens, an optical instrument) in order to position an image with respect to the focal plane while glimpse is to see or view briefly or incompletely.