mainly

Chiefly; for the most part.

She had Lord James' collar in one big fist and she pounded the table with the other and talked a blue streak. Nobody could make out plain what she said, for she was mainly jabbering Swede lingo, but there was English enough, of a kind, to give us some idee.

If you’re looking for the most breathable mask, Lukovics says, “Cotton is preferable, mainly for absorbing moisture/sweat.” She says multiple layers may be more protective but will also impact breathability.

Forcefully, vigorously.

Such breadth of ſhoulders as might mainely beare Olde Atlas burthen, […]

Mainly they all attonce vpon him laid, / And sore beset on euery side around […]

Of the production of a sound: loudly, powerfully.

But in the end, mainly crying out, he fell to raling and wringing his master, upbraiding him that he was not a true Philosopher[…].

To a great degree; very much.