1) Clearly 2) In an intelligible manner 3) Understandably 1) Clearly 2) Understandably 
• (adv.) In an intelligible manner; so as to be understood; clearly; plainly; as, to write or speak intelligibly.
In·tel'li·gi·bly adverb In an intelligible manner; so as to be understood; clearly; plainly; as, to write or speak intelligibly . 
[adv] - in an intelligible manner
intelligibly In an intelligible manner or characterized by a well articulated, enunciated, and loud enough to be heard distinctly.
clearly 1 understandably adverb in an intelligible manner; `the foreigner spoke to us quite intelligibly`