The Collaborative International Dictionary
standoffishly
standoffish \stand*off"ish\, stand-offish \stand-off"ish\a. Shy or distant in manner; cold; aloof; reserved; not friendly.
Syn: offish. [PJC] -- stand*off"ish*ness, n. -- stand*off"ish*ly, adv.
Wiktionary
standoffishly
adv. In a standoffish way.
WordNet
standoffishly
adv. in a standoffish manner; "standoffishly, he declined the invitation to the office party"