1. (p. pr. & vb. n.) of Plug.

2. (n.) The act of stopping with a plug.

3. (n.) The material of which a plug or stopple is made.

application assiduity assiduous assiduousness bulldog tenacity concentration constancy constant continuing diligence diligent dogged dogged perseverance doggedness donkeywork drudge drudgery drudging endurance enduring engrossment faithful fidelity grind grinding grubbing hardworking immutable inalterable indefatigability indefatigable indomitable industrious industriousness industry insistence insistency insistent invincible labor laboring lasting loyal loyalty moil never-tiring obstinacy obstinate patience patience of Job patient patient as Job pegging permanence permanent perseverance perseverant persevering persistence persistency persistent persisting pertinacious pertinaciousness pertinacity plodding preoccupation preoccupied rapt relentless relentlessness resolute resolution sedulity sedulous sedulousness single-minded single-mindedness singleness of purpose slavery slaving sleepless slogging stability stable stamina staying power steadfast steadfastness steadiness steady stick-to-itiveness straining striving struggling stubborn stubbornness sweating tenacious tenaciousness tenacity tireless tirelessness toil toiling unabating unconquerable undaunted undiscouraged undrooping unfailing unfaltering unflagging unflinching unintermitting uninterrupted unnodding unrelaxing unrelenting unremitting unremittingness unsleeping unswerving unswerving attention untiring unwavering unwearied unwearying unwinking utterly attentive weariless working