適切【てきせつ】
appropriate, suitable, fitting, apt, proper, right, pertinent, relevant
適用【てきよう】
applying (e.g. a technology), adoption
適当【てきとう】
suitable, proper, appropriate, adequate, fit, fair, perfunctory, half-minded, sloppy, lazy, careless, noncommittal, unreliable, irresponsible, haphazard
快適【かいてき】
pleasant, agreeable, comfortable
最適【さいてき】
most suitable, optimum, optimal, best
適応【てきおう】
adaptation, accommodation, conformity
適合【てきごう】
conformity, compatibility, adaptability, congruity, congruence
適度【てきど】
moderate (degree), proper (amount), temperate, suitable
適性【てきせい】
aptitude, aptness, suitability
適量【てきりょう】
proper quantity, suitable amount, proper dose, optimal dose
適宜【てきぎ】
suitable, appropriate, fitting, proper, appropriately, accordingly, as required, at one's discretion
適する【てきする】
to fit, to suit