拒绝

My search for a job involved me in many refusals.

He is my good friend and I can't very well turn him down.

reject decidedly/positively

reject flatly/outright

turn down/dismiss a request/demand/requirement

turn down/refuse sb's invitation

refuse visa extension

reject a claim

reject a request

deny/reject sb a visa

repudiate an obligation

refuse sb's help

turn down international mediation

refuse to change one's stand

refuse all responsibilities