| filaggrin | (noun) the main protein of the keratohyalin granules | - |
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| flagging | (adjective) weak from exhaustion | Synonyms: drooping |
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| (noun) a walk of flagstones | - |
| (noun) flagstones collectively | - |
| laggard | (adjective) wasting time | Synonyms: dilatory, pokey, poky |
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| (noun) someone who takes more time than necessary; someone who lags behind | Synonyms: dawdler, drone, lagger, poke, trailer |
| lagger | (noun) someone who takes more time than necessary; someone who lags behind | Synonyms: dawdler, drone, laggard, poke, trailer |
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| lagging | (noun) insulation used to wrap around pipes or boilers or laid in attics to prevent loss of heat | - |
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| unflagging | (adjective) tireless | Synonyms: unfailing |
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| (adjective) showing sustained enthusiastic action with unflagging vitality | Synonyms: indefatigable, tireless, unwearying |