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English word comfortable comes from Latin fortis, Latin con-, and later Latin conforto (I become stronger. I take courage.)
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fortis (Latin)
(figuratively) courageous, brave, steadfast. Strong (physically powerful).
con- (Latin)
Used in compounds to indicate a being or bringing together of several objects. Used in compounds to indicate the completeness, perfecting of any act, and thus gives intensity to the signification of the simple word.
conforto (Latin)
I become stronger. I take courage.
confortare (Late Latin)
conforter (Old French)
To comfort. To reassure.
confortable (Old French)
comfortable (English)
(US) A stuffed or quilted coverlet for a bed; a comforter. (obsolete) Comforting, providing comfort; consolatory. [14th-19thc.]. (obsolete) Serviceable; helpful.. (obsolete) Strong; vigorous; valiant.. Amply sufficient, satisfactory. [from 17thc.]. In a state of comfort and content. [from 18thc.]. Providing physical comfort and ease; agreeable. [from 18thc.].