Not weary (of); free from weariness; unwearied.

Of persons, things, etc.: Not wearied, tired, or tired out; also, never becoming weary; indefatigable.

Of a person, disposition, etc.: steadfast, persistent, persevering. Also in extended use: repetitive, frequent.

That continues (in various senses of the verb); abiding, lasting; persistent, persevering.

That perseveres; persistent.

Of a person: persistent or pressing in making requests or offers, esp. to an irritating or distressing degree. Of a request, offer, etc.: made…

Incapable of being wearied; untiring, indefatigable, adj.

Indefatigable.

That persists, persistent.

Incapable of being or becoming wearied or tired; indefatigable, unremitting. Of persons or things.

That holds fast (literal and figurative); having a firm hold or grasp; persistent.

Incapable of being wearied; that cannot be tired out; unwearied, untiring, unremitting in labour or effort. Of persons or things personified.

Able to continue a course of action without being daunted by difficulties or hindrances; persevering, diligent; painstaking.

Exempt from fainting; unflagging.

Not tired or exhausted; unwearied.

Const. by, with, and †of.

Of persons or agents: = assiduous, adj. 1.

Not weakening or slackening in vigour or determination, as in the pursuit of a particular course of action or the adoption of a particular stance…

Characterized by persistence, persistent; tending to persist. Now rare.

That does not grow or become weary; unremitting, untiring.

Modifying an agent noun: that performs the specified action with great force, exertion, or persistence; unremitting; diligent. Also: that performs…

Unwearied, untiring.

transferred. Of a person: Continually engaged in the action denoted by the noun (or by the context).

Of persons or agents: Constant in application to the business in hand, persevering, sedulous, unwearyingly diligent.

In neutral or positive sense: having the persistence or tenacity characteristic of some breeds of dog; obstinate, stubborn; resolute. (Now the…

Of a person: never relaxing or slackening in activity or effort; persistent, unrelenting (in an activity).

Of a person or his attributes: Incapable of being exhausted or worn out in strength or vigour.

Of a person: persistent or unrelenting (in a task or activity); = unremitting, adj. 2. Now rare.

(un-, prefix1 affix 4)

Continuing firmly or obstinately in some state, opinion, purpose, or course of action, esp. despite opposition, setbacks, or failure; having or…

Persistent, dogged.