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Webster 1913 Edition

adv.

In a loyal manner; faithfully.

adv.

With fidelity to a prince or sovereign, or to a husband or lover.

loyally ‎(comparative more loyally, superlative most loyally)

In a loyal manner, faithfully.
The old dog loyally followed his master even if he didn't really want to go out.

in a loyal manner

Ido: loyale (io)
Italian: lealmente (it)
Portuguese: lealmente
Russian: пре́данно (ru) ‎(prédanno), ве́рно (ru) ‎(vérno), лоя́льно (ru) ‎(lojálʹno)
Spanish: lealmente (es)