> Eiríkur reið til skips og aðrir landsmenn og tókst með þeim greiðleg

kaupstefna.

> Eirik rode to the ships with other Countrymen and they had there

(took with them) good trading. [Yorkshire dialect for good/fine is
gradely - perhaps from this word greiðleg]

The OED agrees:

"ME. greiðlic, a. ON. greiðlig-r, f. greið-r GRAITH a. + -lig-r -LY1."