1. Deviating from the expected or normal; strange: a queer situation.
2. Odd or unconventional, as in behavior; eccentric. See Synonyms at strange.
3. Of a questionable nature or character; suspicious.
4. Slang Fake; counterfeit.
5. Feeling slightly ill; queasy.
6. Offensive Slang Homosexual.
7. Usage Problem Of or relating to lesbians, gay men, bisexuals, or transgendered people.

1. Offensive Slang Used as a disparaging term for a homosexual person.
2. Usage Problem A lesbian, gay male, bisexual, or transgendered person.

1. To ruin or thwart: "might try to queer the Games with anything from troop movements . . . to a bomb attack" (Newsweek).
2. To put (someone) in a bad position.

Usage Note: A reclaimed word is a word that was formerly used solely as a slur but that has been semantically overturned by members of the maligned group, who use it as a term of defiant pride. Queer is an example of a word undergoing this process. For decades queer was used solely as a derogatory adjective for gays and lesbians, but in the 1980s the term began to be used by gay and lesbian activists as a term of self-identification. Eventually, it came to be used as an umbrella term that included gay men, lesbians, bisexuals, and transgendered people. Nevertheless, a sizable percentage of people to whom this term might apply still hold queer to be a hateful insult, and its use by heterosexuals is often considered offensive. Similarly, other reclaimed words are usually offensive to the in-group when used by outsiders, so extreme caution must be taken concerning their use when one is not a member of the group.