LENGTHILY
lengthily, at length
(adverb) in a lengthy or prolix manner; “the argument went on lengthily”; “she talked at length about the problem”
Source: WordNet® 3.1
Etymology
Adverb
lengthily (comparative more lengthily, superlative most lengthily)
In a lengthy way, in a manner that is long and drawn out, especially in time.
Synonyms
• at length, enduringly, protractedly; see also lastingly
Source: Wiktionary
Length"i*ly, adv.
Definition: In a lengthy manner; at great length or extent.
LENGTHY
Length"y, a. [Compar. Lengthier; superl. Lengthiest.]
Definition: Having length; rather long or too long; prolix; not brief; --
said chiefly of discourses, writings, and the like. "Lengthy
periods." Washington. "Some lengthy additions." Byron. "These would
be details too lengthy." Jefferson. "To cut short lengthy
explanations." Trench.
Source: Webster’s Unabridged Dictionary 1913 Edition